% Encoding: UTF-8
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@article{faucris.258785757,
abstract = {Three novel types of spatially resolved graphene architectures GA, GB, and GC respectively bearing CH3-, C6H5- and C3F7 groups are efficiently constructed by newly developed laser-writing concepts using silver carboxylates as corresponding photosensitizers. These 2D-structured samples are unequivocally characterized by Raman spectroscopy and SEM-EDS. This journal is},
author = {Wei, Tao and Liu, Xin and Al-Fogra, Sabrin and Bachmann, Julien and Hauke, Frank and Hirsch, Andreas},
doi = {10.1039/d1cc00902h},
faupublication = {yes},
journal = {Chemical Communications},
note = {CRIS-Team Scopus Importer:2021-05-21},
pages = {4654-4657},
peerreviewed = {Yes},
title = {{A} general concept for highly efficient covalent laser patterning of graphene based on silver carboxylates},
volume = {57},
year = {2021}
}
@article{faucris.110580844,
abstract = {Alkoxide-intercalated NiFe-layered double hydroxides were synthesized via the nonaqueous methanolic route. These nanoplatelets exhibit high crystalline quality as demonstrated by atomic resolution scanning transmission electron microscopy combined with electron energy-loss spectroscopy. Moreover, the presence of the alkoxide moieties has been unambiguously demonstrated by means of thermogravimetric analysis coupled to a mass spectrometer. These NiFe-LDHs can be exfoliated in water or organic solvents and processed into homogeneous ultra-thin films (<3 nm thick) with the assistance of O-2-plasma. The study of their behaviour as water oxidation electrocatalysts has shown an outstanding performance at basic pHs (small overpotential of ca. 249 mV and Tafel slopes in the range of 52-55 mV per decade).},
author = {Carrasco, Jose and Romero, Jorge and Varela, Maria and Hauke, Frank and Abellan Saez, Gonzalo and Hirsch, Andreas and Coronado, Eugenio},
doi = {10.1039/c6qi00009f},
faupublication = {yes},
journal = {Inorganic Chemistry Frontiers},
pages = {478-487},
peerreviewed = {unknown},
title = {{Alkoxide}-intercalated {NiFe}-layered double hydroxides magnetic nanosheets as efficient water oxidation electrocatalysts},
volume = {3},
year = {2016}
}
@article{faucris.107585984,
abstract = {Covalent functionalization by addition to the sidewalls of single-walled carbon, nanotubes (SWCNTs) is one of the most important methods for the derivatization of carbon nanotubes. The nucleophilic addition of organometallic reagents (carbon- and nitrogen-based carbanions) has recently become a widely used tool for the introduction of functional moieties onto the surface of this new carbon allotrope. The extension, of this concept by the successful, nucleophilic addition of in situ generated lithium acetylides to the SWCNT scaffold is presented herein. The chemically derivatized SWCNTs have been characterized, in detail by TGA/MS, Raman, UV/Vis/NIR and fluorescence spectroscopy. On the basis of a detailed examination of the signals in the radial breathing-mode region of the Raman spectra, the preferred functionalization of smaller-diameter tubes has been clearly demonstrated. © 2010 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.},
author = {Gebhardt, Benjamin and Graupner, Ralf and Hauke, Frank and Hirsch, Andreas},
doi = {10.1002/ejoc.200900848},
faupublication = {yes},
journal = {European Journal of Organic Chemistry},
pages = {1494-1501},
peerreviewed = {Yes},
title = {{A} novel {Diameter}-{Selective} functionalization of {SWCNTs} with lithium alkynylides},
year = {2010}
}
@article{faucris.227002159,
abstract = {Graphene has been covalently functionalized through a one-pot reductive pathway using graphite intercalation compounds (GICs), in particular KC8, with three different orthogonally protected derivatives of 4-aminobenzylamine. This novel multifunctional platform exhibits excellent bulk functionalization homogeneity (Hbulk) and degree of addition while preserving the chemical functionalities of the organic addends through different protecting groups, namely: tert-butyloxycarbonyl (Boc), benzyloxycarbonyl (Cbz) and phthalimide (Pht). We have employed (temperature-dependent) statistical Raman spectroscopy (SRS), X-ray photoelectron spectroscopy (XPS), magic angle spinning solid state 13C NMR (MAS-NMR), and a characterization tool consisting of thermogravimetric analysis coupled with gas chromatography and mass spectrometry (TG-GC-MS) to unambiguously demonstrate the covalent binding and the chemical nature of the different molecular linkers. This work paves the way for the development of smart graphene-based materials of great interest in biomedicine or electronics, to name a few, and will serve as a guide in the design of new 2D multifunctional materials.},
author = {Lucherelli, Matteo Andrea and Raya, Jésus and Edelthalhammer, Konstantin and Hauke, Frank and Hirsch, Andreas and Abellán, Gonzalo and Bianco, Alberto},
doi = {10.1002/chem.201903165},
faupublication = {yes},
journal = {Chemistry - A European Journal},
keywords = {carbon materials; diazonium salts; functionalization; graphite; orthogonal protection},
note = {CRIS-Team Scopus Importer:2019-09-24},
peerreviewed = {Yes},
title = {{A} {Straightforward} {Approach} to {Multifunctional} {Graphene}},
year = {2019}
}
@article{faucris.247285927,
abstract = {We report here a straightforward reductive approach for the deoxygenation, activation and functionalization of ultrashort single-walled carbon nanotubes (us-SWCNTs). Us-SWCNTs with lengths of only 20–50 nm were prepared by the low-temperature oxidative-cutting process which inevitably introduced oxygen-containing groups onto the nanotube framework. For the subsequent deoxygenation, six routes have been investigated and the reduction with potassium is the optimal one that can efficiently remove the oxidized groups and consequently recover the inherent structures and properties of us-SWCNTs. This reductive approach permits at the same time very efficient activation of the chemically inert nanotubes by generating the intermediate us-SWCNTn- carbanions. Subsequent quenching these negative charges on the nanotube backbone using electrophiles affords very efficient covalent binding of distinct building blocks as porphyrin, phenyl or hexyl moieties onto us-SWCNTs. Additionally, the Birch-type reductive approach was also performed to realize the first hydrogenation of us-SWCNTs by using water as proton source and lithium as reducing agent.},
author = {Bao, Lipiao and Martin, Oliver and Wei, Tao and Perez-Ojeda Rodriguez, Maria Eugenia and Hauke, Frank and Hirsch, Andreas},
doi = {10.1016/j.carbon.2020.09.078},
faupublication = {yes},
journal = {Carbon},
keywords = {Activation; Carbon nanotube; Functionalization; High degree of functionalization; Reduction; Ultrashort carbon nanotube},
month = {Jan},
note = {CRIS-Team Scopus Importer:2020-12-25},
pages = {768-776},
peerreviewed = {Yes},
title = {{A} straightforward reductive approach for the deoxygenation, activation and functionalization of ultrashort single-walled carbon nanotubes},
volume = {171},
year = {2021}
}
@article{faucris.120400324,
abstract = {Through a combination of an electronic-type selective diazonium-based attachment of a Hamilton receptor unit onto the carbon nanotube framework and a supramolecular recognition approach of a cyanuric acid derivative, we herein introduce a highly promising strategy for the tuning of carbon nanotube solubility and, directly related to that, a solution-based easy and straightforward separation of covalently functionalized carbon nanotube derivatives with respect to their unfunctionalized counterparts. The supramolecular complexation of the cyanuric acid derivative provides the driving force for the dramatically increased dispersibility and for the long-time stability of the individualized single-walled carbon nanotube derivatives in chloroform. The selective covalent functionalization of metallic carbon nanotubes can easily be analyzed with the aid of scanning Raman microscopy techniques. The functional derivatives have furthermore been characterized by UV/Vis-NIR and fluorescence spectroscopy as well as by mass spectrometric coupled thermogravimetric analysis. The investigation of the supramolecular complexation is based on an in-depth UV/Vis-NIR analysis and atomic force microscopy investigations. © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.},
author = {Bosch, Sebastian and Zeininger, Lukas and Hauke, Frank and Hirsch, Andreas and Hauke, Frank},
doi = {10.1002/chem.201303506},
faupublication = {yes},
journal = {Chemistry - A European Journal},
pages = {2537-2541},
peerreviewed = {Yes},
title = {{A} supramolecular approach for the facile solubilization and separation of covalently functionalized single-walled carbon nanotubes},
volume = {20},
year = {2014}
}
@article{faucris.274944751,
abstract = {Covalent functionalisation can be a powerful lever to tune the properties and processability of graphene. After overcoming the low chemical reactivity of graphene, covalent functionalisation led to the generation of new hybrid materials, applicable in a broad variation of fields. Although the process of functionalising graphene is nowadays firmly established, fundamental aspects of the produced hybrid materials remain to be clarified. Especially the atomically resolved imaging is only scarcely explored. Here we show aberration corrected in situ high resolution TEM imaging of dodecyl functionalised monolayer graphene at atomic resolution after an effective mechanical filtering approach. The mechanical filtering allows to separate adsorbed contamination from the covalently bound functional molecules and thus opens the possibility for the observation of this hybrid material. The obtained data is validated by DFT calculations and by a novel image simulation approach based on molecular dynamics (MD) simulations at room temperature.},
author = {Dolle, Christian and Schweizer, Peter and Dasler, Daniela and Gsänger, Sebastian and Maidl, Robert and Abellán, Gonzalo and Hauke, Frank and Meyer, Bernd and Hirsch, Andreas and Spiecker, Erdmann},
doi = {10.1038/s41699-022-00304-w},
faupublication = {yes},
journal = {npj 2D Materials and Applications},
note = {CRIS-Team WoS Importer:2022-05-13},
peerreviewed = {Yes},
title = {{Atomically} resolved {TEM} imaging of covalently functionalised graphene},
volume = {6},
year = {2022}
}
@article{faucris.107587524,
abstract = {Reel them in: Wavelength-resolved movies of the centrifugal fractionation of a single-walled carbon nanotube dispersion (see picture) are used to obtain the composition and absorption profiles of all fractions even in a complex dispersion, where nanotubes have been efficiently solubilized by an intercalant-surfactant mixture. Copyright © 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.},
author = {Karabudak, Engin and Backes, Claudia and Hauke, Frank and Schmidt, Cordula and Cölfen, Helmut and Hirsch, Andreas and Wohlleben, Wendel},
doi = {10.1002/cphc.201000504},
faupublication = {yes},
journal = {ChemPhysChem},
pages = {3224-3227},
peerreviewed = {Yes},
title = {{A} {Universal} {Ultracentrifuge} {Spectrometer} {Visualizes} {CNT}-{Intercalant}-{Surfactant} {Complexes}},
volume = {11},
year = {2010}
}
@article{faucris.113298064,
abstract = {Although transition metal dichalcogenides such as MoS2 have been recognized as highly potent two-dimensional nanomaterials, general methods to chemically functionalize them are scarce. Herein, we demonstrate a functionalization route that results in organic groups bonded to the MoS2 surface via covalent C-S bonds. This is based on lithium intercalation, chemical exfoliation and subsequent quenching of the negative charges residing on the MoS2 by electrophiles such as diazonium salts. Typical degrees of functionalization are 10-20 atom % and are potentially tunable by the choice of intercalation conditions. Significantly, no further defects are introduced, and annealing at 350 °C restores the pristine 2H-MoS2. We show that, unlike both chemically exfoliated and pristine MoS2, the functionalized MoS2 is very well dispersible in anisole, confirming a significant modification of the surface properties by functionalization. DFT calculations show that the grafting of the functional group to the sulfur atoms of (charged) MoS2 is energetically favorable and that S-C bonds are formed.},
author = {Knirsch, Kathrin and Nerl, Hannah C. and Cucinotta, Clotilde S. and Berner, Nina and Gholamvand, Zahra and McEvoy, Niall and Wang, Zhenxing and Abramovic, Irena and Vecera, Philipp and Halik, Marcus and Sanvito, Stefano and Duesberg, Georg S. and Nicolosi, Valeria and Hauke, Frank and Hirsch, Andreas and Coleman, Jonathan N. and Backes, Claudia},
doi = {10.1021/acsnano.5b00965},
faupublication = {yes},
journal = {ACS nano},
keywords = {1T-polytype; basal-plane; chemical exfoliation; covalent functionalization; layered materials; molybdenum disulfide; transition metal dichalcogenides},
pages = {6018-6030},
peerreviewed = {Yes},
title = {{Basal}-{Plane} {Functionalization} of {Chemically} {Exfoliated} {Molybdenum} {Disulfide} by {Diazonium} {Salts}},
volume = {9},
year = {2015}
}
@article{faucris.108693904,
abstract = {The hydrogenation and deuteration of graphite with potassium intercalation compounds as starting materials were investigated in depth. Characterization of the reaction products (hydrogenated and deuterated graphene) was carried out by thermogravimetric analysis coupled with mass spectrometry (TG-MS) and statistical Raman spectroscopy (SRS) and microscopy (SRM). The results reveal that the choice of the hydrogen/deuterium source, the nature of the graphite (used as starting material), the potassium concentration in the intercalation compound, and the choice of the solvent have a great impact on the reaction outcome. Furthermore, it was possible to prove that both mono- and few-layer hydrogenated/deuterated graphene can be produced.},
author = {Schäfer, Ricarda and Dasler, Daniela and Mundloch, Udo and Hauke, Frank and Hirsch, Andreas},
doi = {10.1021/jacs.5b11994},
faupublication = {yes},
journal = {Journal of the American Chemical Society},
pages = {1647-52},
peerreviewed = {Yes},
title = {{Basic} {Insights} into {Tunable} {Graphene} {Hydrogenation}},
volume = {138},
year = {2016}
}
@article{faucris.109826024,
abstract = {Herein we report on the facile preparation of brominated SWCNTs based on two complementary reductive activation routes. The respective brominated SWCNTs are highly reactive and can be used in nucleophilic substitution reactions and represent versatile starting materials for the generation of sidewall functionalized SWCNTs with a high density of functional moieties. This journal is © the Partner Organisations 2014.},
author = {Hof, Ferdinand and Hauke, Frank and Hirsch, Andreas and Hauke, Frank},
doi = {10.1039/c4cc00719k},
faupublication = {yes},
journal = {Chemical Communications},
pages = {6582-6584},
peerreviewed = {Yes},
title = {{Brominated} single walled carbon nanotubes as versatile precursors for covalent sidewall functionalization},
volume = {50},
year = {2014}
}
@article{faucris.120292964,
abstract = {The thermal treatment of the azaheterofullerene dimer (CN) in the presence of oxygen and a nucleophilic trapping reagent leads to the facile and selective formation of a variety of monomeric adducts CNR involving electronic rich aromatics, carbonyl compounds, alcohols and olefins as terminating addend. These investigations within the field of synthetic heterofullerene chemistry imply the presence of CN as an important key intermediate. © 2001 Elsevier Science Ltd.},
author = {Hauke, Frank and Hirsch, Andreas and Hauke, Frank},
doi = {10.1016/S0040-4020(01)00235-6},
faupublication = {yes},
journal = {Tetrahedron},
pages = {3697-3708},
peerreviewed = {Yes},
title = {{C59N}+: {A} key intermediate in azaheterofullerene chemistry},
volume = {57},
year = {2001}
}
@article{faucris.266229805,
abstract = {Herein we report the synthesis of covalently functionalized carbon
nano-onions (CNOs) via a reductive approach using unprecedented
alkali-metal CNO intercalation compounds. For the first time, an in situ
Raman study of the controlled intercalation process with potassium has
been carried out revealing a Fano resonance in highly doped CNOs. The
intercalation was further confirmed by electron energy loss spectroscopy
and X-ray diffraction. Moreover, the experimental results have been
rationalized with DFT calculations. Covalently functionalized CNO
derivatives were synthesized by using phenyl iodide and n-hexyl
iodide as electrophiles in model nucleophilic substitution reactions.
The functionalized CNOs were exhaustively characterized by statistical
Raman spectroscopy, thermogravimetric analysis coupled with gas
chromatography and mass spectrometry, dynamic light scattering, UV–vis,
and ATR-FTIR spectroscopies. This work provides important insights into
the understanding of the basic principles of reductive CNOs
functionalization and will pave the way for the use of CNOs in a wide
range of potential applications, such as energy storage, photovoltaics,
or molecular electronic},
author = {Perez-Ojeda Rodriguez, Maria Eugenia and Castro, Edison and Kröckel, Claudia and Lucherelli, Matteo Andrea and Ludacka, Ursula and Kotakoski, Jani and Werbach, Katharina and Peterlik, Herwig and Melle-Franco, Manuel and Chacón-Torres, Julio C. and Hauke, Frank and Echegoyen, Luis and Hirsch, Andreas and Abellán, Gonzalo},
doi = {10.1021/jacs.1c07604},
faupublication = {yes},
journal = {Journal of the American Chemical Society},
peerreviewed = {Yes},
title = {{Carbon} {Nano}-onions: {Potassium} {Intercalation} and {Reductive} {Covalent} {Functionalization}},
year = {2021}
}
@article{faucris.120263704,
abstract = {Covalent addition reactions turned out to be one of the most important functionalization techniques for a structural alteration of single walled carbon nanotube (SWCNT) scaffolds. During the last years, several reaction sequences based on an electrophilic interception of intermediately generated SWCNT carbanions, obtained via Birch reduction or by a nucleophilic addition of organometallic species, have been developed. Nevertheless, the scope and the variety of potential electrophiles is limited due to the harsh reaction conditions requested for a covalent attachment of the functional entities onto the SWCNT framework. Herein, we present a significant modification of the reductive alkylation/arylation sequence, the so-called Billups reaction, which extends the portfolio of electrophiles for covalent sidewall functionalization to carbonyl compounds-ketones, esters, and even carboxylic acid chlorides. Moreover, these carbonyl-based electrophiles can also be used as secondary functionalization reagents for anionic SWCNT intermediates, derived from a primary nucleophilic addition step. This directly leads to the generation of mixed functional SWCNT architectures, equipped with hydroxyl or carbonyl anchor groups, suitable for ongoing derivatization reactions. A correlated absorption and emission spectroscopic study elucidates the influence of the covalent sidewall functionalization degree onto the excitonic transition features of carbon nanotubes. The characterization of the different SWCNT adducts has been carried out by means of Raman, UV-vis/nIR, and fluorescence spectroscopy as well as by thermogravimetric analysis combined with mass spectrometry and X-ray photoelectron spectroscopy analysis. © 2011 American Chemical Society.},
author = {Gebhardt, Benjamin and Syrgiannis, Zois and Backes, Claudia and Graupner, Ralf and Hirsch, Andreas and Hauke, Frank},
doi = {10.1021/ja2016872},
faupublication = {yes},
journal = {Journal of the American Chemical Society},
pages = {7985-7995},
peerreviewed = {Yes},
title = {{Carbon} nanotube sidewall functionalization with carbonyl compounds-modified birch conditions vs the organometallic reduction approach},
volume = {133},
year = {2011}
}
@article{faucris.230913731,
abstract = {An efficient route to synthesize macroscopic amounts of graphene is highly desired and bulk characterization of such samples, in terms of the number of layers, is equally important. We present a Raman spectroscopy-based method to determine the typical upper limit of the number of graphene layers in chemically exfoliated graphene. We utilize a controlled vapour-phase potassium intercalation technique and identify a lightly doped stage, where the Raman modes of undoped and doped few-layer graphene flakes coexist. The spectra can be unambiguously distinguished from alkali doped graphite, and modeling with the typical upper limit of the layers yields an upper limit of flake thickness of five layers with a significant single-layer graphene content. Complementary statistical AFM measurements on individual few-layer graphene flakes find a consistent distribution of the layer numbers.},
author = {Szirmai, Péter and Márkus, Bence G. and Chacón-Torres, Julio C. and Eckerlein, Philipp and Edelthalhammer, Konstantin and Englert, Jan and Mundloch, Udo and Hirsch, Andreas and Hauke, Frank and Náfrádi, Bálint and Forró, László and Kramberger, Christian and Pichler, Thomas and Simon, Ferenc},
doi = {10.1038/s41598-019-55784-6},
faupublication = {yes},
journal = {Scientific Reports},
note = {CRIS-Team Scopus Importer:2019-12-31},
peerreviewed = {Yes},
title = {{Characterizing} the maximum number of layers in chemically exfoliated graphene},
volume = {9},
year = {2019}
}
@article{faucris.115045744,
abstract = {The complete assignment of all 31 (CNMR)-C-13 signals which are due to the fullerene carbon atoms of monoazafullerene derivatives has been carried out for the first time by the systematic comparison of experimental and theoretical spectra calculated by high level DFT methods (GIAO-B3LYP/6-31G*/B3LYP/6-31G*). The assignment is facilitated by the striking similarities of the signal patterns of the sp(2)-fullerene carbon atoms of two different families of such heteroftillerene derivatives with both aryl and alkyl addends.},
author = {Hauke, Frank and Chen, Zhongfang and Hirsch, Andreas},
faupublication = {yes},
journal = {Polish Journal of Chemistry},
keywords = {fullerene;heteroftillerene;NMR spectroscopy;DFT calculation;chemical shift},
pages = {971-983},
peerreviewed = {Yes},
title = {{Complete} assignment of {All} {C}-13 {NMR} signals of {C}-s symmetric monoazafullerene derivatives by comparison of experimental and calculated {Spektra}},
url = {https://www.scopus.com/record/display.uri?eid=2-s2.0-34547163378&origin=inward},
volume = {81},
year = {2007}
}
@article{faucris.226866192,
abstract = {We present an in-depth qualitative and quantitative analysis of a reaction between 4-iodobenzenediazonium tetrafluoroborate and single-walled carbon nanotubes (SWCNTs) via thermogravimetric analysis coupled with mass spectrometry (TG-MS) or a gas chromatography and mass spectrometry (TG-GC-MS) as well as Raman spectroscopy. We propose a method for precise determination of the degree of functionalization and quantification of physisorbed aromates, detaching around their boiling point, alongside covalently bonded ones (cleavage over 200 °C). While the presence of some side products like phenol- or biphenyl species could be excluded, residual surfactant and minor amounts of benzene could be identified. A concentration-dependent experiment shows that the degree of functionalization increases with the logarithm of the concentration of applied diazonium salt, which can be exploited to precisely adjust the amount of aryl addends on the nanotube sidewall, up to 1 moiety per 100 carbon atoms.},
author = {Schirowski, Milan and Hauke, Frank and Hirsch, Andreas},
doi = {10.1002/chem.201902330},
faupublication = {yes},
journal = {Chemistry - A European Journal},
keywords = {diazo compounds; nanotubes; quantification; surfactants; thermogravimetry},
note = {CRIS-Team Scopus Importer:2019-09-20},
peerreviewed = {Yes},
title = {{Controlling} the {Degree} of {Functionalization}: {In}-{Depth} {Quantification} and {Side}-{Product} {Analysis} of {Diazonium} {Chemistry} on {SWCNTs}},
year = {2019}
}
@article{faucris.256242854,
abstract = {The solid-state synthesis of pure sodium-black phosphorus intercalation compounds (Na-BPICs) has been optimized in bulk for two stoichiometric ratios. Specifically, in-situ X-Ray diffraction (XRD) allowed the precise identification of the optimal temperature range for the formation of Na-BPICs: 94 degrees C-96 degrees C. Moreover, as the undesired formation of Na3P takes place at this very same range, we succeeded in introducing a new synthetic route based on a fast-thermal ball milling implementation that results in the bulk production of BPIC without Na3P in 9 out of 10 cases. Finally, by combining XRD, Raman spectroscopy, and DFT calculations we developed a new structural model for Na-based BPICs showing an increase of BP's unit cell with Na atoms incorporated in every second layer. These results will pave the way for the large-scale synthesis and application of pure BPICs, which are of great interest in fields such as optoelectronics or energy storage.},
author = {Werbach, Katharina and Neiß, Christian and Muellner, Alexander and Abellan, Gonzalo and Setman, Daria and Lloret, Vicent and Wild, Stefan and Hauke, Frank and Pichler, Thomas and Hirsch, Andreas and Peterlik, Herwig},
doi = {10.1002/batt.202100053},
faupublication = {yes},
journal = {Batteries & Supercaps},
note = {CRIS-Team WoS Importer:2021-04-23},
peerreviewed = {Yes},
title = {{Controlling} the {Formation} of {Sodium}/{Black} {Phosphorus} {IntercalationCompounds} {Towards} {High} {Sodium} {Content}},
year = {2021}
}
@article{faucris.107589064,
abstract = {The effect of alkali metal counterions on the aggregation behaviour of an anionic perylene dye has been investigated by absorption and emission spectroscopy. In the presence of Na aggregation is enhanced leading to a decreased surfactant capability for the dispersion of carbon nanotubes. © The Royal Society of Chemistry 2011.},
author = {Backes, Claudia and Schunk, Torsten and Hauke, Frank and Hirsch, Andreas},
doi = {10.1039/c0jm02505d},
faupublication = {yes},
journal = {Journal of Materials Chemistry},
pages = {3554-3557},
peerreviewed = {Yes},
title = {{Counterion} effect on the aggregation of anionic perylene dyes and the influence on carbon nanotube dispersion efficiencies},
volume = {21},
year = {2011}
}
@article{faucris.243936998,
abstract = {We report a facile and efficient method for the covalent 2D-patterning of monolayer graphene via laser irradiation. We utilized the photo-cleavage of dibenzoylperoxide (DBPO) and optimized the subsequent radical additions to non-activated graphene up to that level where controlled covalent 2D-patterning of graphene initiated by spatially resolved laser writing is possible. The covalent 2D-functionalization of graphene, which is monitored by scanning Raman microscopy (SRM) is completely reversible. This new concept enables write/read/erase control over the covalent chemical information stored on the graphene surface.},
author = {Edelthalhammer, Konstantin and Dasler, Daniela and Jurkiewicz, Lisa and Nagel, Tamara and Al-Fogra, Sabrin and Hauke, Frank and Hirsch, Andreas and Al-Fogra, Sabrin},
doi = {10.1002/anie.202006874},
faupublication = {yes},
journal = {Angewandte Chemie International Edition},
keywords = {covalent functionalization; covalent patterning; graphene; Raman spectroscopy; write/read/erase},
note = {CRIS-Team Scopus Importer:2020-10-16},
peerreviewed = {Yes},
title = {{Covalent} {2D}-{Engineering} of {Graphene} by {Spatially} {Resolved} {Laser} {Writing}/{Reading}/{Erasing}},
year = {2020}
}
@article{faucris.257701464,
abstract = {A very facile and efficient protocol for the covalent patterning and properties tuning of graphene is reported. Highly reactive fluorine radicals were added to confined regions of graphene directed by laser writing on graphene coated with 1-fluoro-3,3-dimethylbenziodoxole. This process allows for the realization of exquisite patterns on graphene with resolutions down to 200 nm. The degree of functionalization, ranging from the unfunctionalized graphene to extremely high functionalized graphene, can be precisely tuned by controlling the laser irradiation time. Subsequent substitution of the initially patterned fluorine atoms afforded an unprecedented graphene nanostructure bearing thiophene groups. This substitution led to a complete switch of both the electronic structure and the polarization within the patterned graphene regions. This approach paves the way towards the precise modulation of the structure and properties of nanostructured graphene.},
author = {Bao, Lipiao and Zhao, Baolin and Assebban, M'hamed and Halik, Marcus and Hauke, Frank and Hirsch, Andreas},
doi = {10.1002/chem.202100941},
faupublication = {yes},
journal = {Chemistry - A European Journal},
keywords = {covalent patterning; fluorination; graphene; polarization switch; substitution},
note = {CRIS-Team Scopus Importer:2021-05-07},
peerreviewed = {Yes},
title = {{Covalent} {2D} {Patterning}, {Local} {Electronic} {Structure} and {Polarization} {Switching} of {Graphene} at the {Nanometer} {Level}},
year = {2021}
}
@article{faucris.112660724,
abstract = {Graphene, a truly two-dimensional and fully π-conjugated honeycomb carbon network, is currently evolving into the most promising successor to silicon in micro- and nanoelectronic applications. However, its wider application is impeded by the difficulties in opening a bandgap in its gapless band-structure, as well as the lack of processability in the resultant intrinscially insoluble material. Covalent chemical modification of the π-electron system is capable of addressing both of these issues through the introduction of variable chemical decoration. Although there has been significant research activity in the field of functionalized graphene, most work to date has focused on the use of graphene oxide. In this Article, we report on the first wet chemical bulk functionalization route beginning with pristine graphite that does not require initial oxidative damage of the graphene basal planes. Through effective reductive activation, covalent functionalization of the charged graphene is achieved by organic diazonium salts. Functionalization was observed spectroscopically, and successfully prevents reaggregation while providing solubility in common organic media. © 2011 Macmillan Publishers Limited. All rights reserved.},
author = {Englert, Jan and Dotzer, Christoph and Yang, Guang and Schmid, Martin and Papp, Christian and Gottfried, Michael and Steinrück, Hans-Peter and Spiecker, Erdmann and Hauke, Frank and Hirsch, Andreas and Hauke, Frank and Spiecker, Erdmann},
doi = {10.1038/nchem.1010},
faupublication = {yes},
journal = {Nature Chemistry},
pages = {279-286},
peerreviewed = {Yes},
title = {{Covalent} bulk functionalization of graphene},
volume = {3},
year = {2011}
}
@incollection{faucris.120264584,
author = {Hauke, Frank and Hirsch, Andreas and Hauke, Frank},
booktitle = {Carbon Nanotubes and Related Structures: Synthesis, Characterization, Functionalization, and Applications},
doi = {10.1002/9783527629930.ch6},
editor = {Prof. Dr. Dirk M. Guldi, Prof. Dr. Nazario Martín},
faupublication = {yes},
pages = {135-198},
peerreviewed = {unknown},
publisher = {Wiley-VCH Verlag GmbH & Co. KGaA},
title = {{Covalent} {Functionalization} of {Carbon} {Nanotubes}},
year = {2010}
}
@article{faucris.219414473,
abstract = {
Using a reductive sidewall functionalization concept, we prepared for the first time a covalent inter-carbon-allotrope hybrid consisting of single-walled carbon nanotubes (SWCNTs) and the endohedral fullerene Sc
3
N@C
80
. The new compound type was characterized through a variety of techniques including absorption spectroscopy, Raman spectroscopy, TG-MS, TG-GC-MS, and MALDI-TOF MS. HRTEM investigations were carried out to visualize this highly integrated architecture.
},
author = {Wei, Tao and Martin, Oliver and Chen, Muqing and Yang, Shangfeng and Hauke, Frank and Hirsch, Andreas},
doi = {10.1002/anie.201902595},
faupublication = {yes},
journal = {Angewandte Chemie International Edition},
keywords = {carbon nanotubes; endohedral metallofullerene; HRTEM; hybrid materials; Raman spectroscopy},
note = {CRIS-Team Scopus Importer:2019-06-04},
peerreviewed = {Yes},
title = {{Covalent} {Inter}-{Carbon}-{Allotrope} {Architectures} {Consisting} of the {Endohedral} {Fullerene} {Sc3N}@{C80and} {Single}-{Walled} {Carbon} {Nanotubes}},
year = {2019}
}
@article{faucris.226553174,
abstract = {Inter-synthetic-carbon-allotrope (SCA) architectures are constructed by hybridizing different types of carbon allotropes such as OD-fullerene, 1D-carbon nanotubes (CNTs), and 2D-graphene. Also hybridizations of different fullerene families (e.g., empty fullerene, heterofullerenes, and endohedral fullerenes as well as their isomers) are considered as inter-SCA architectures and represent an emerging class of nanofunctional materials. Such highly integrated hybrids are quite promising, since they hold the potential of combining unique properties of each building block. For instance, hybridization of 2D-graphene, a synthetic carbon allotrope with outstanding chemical/physical properties, with OD-fullerenes leads to materials with both outstanding solid state properties (e.g., electron mobility, flexibility, transparency, and mechanical stability) and distinct molecular properties (spatially resolved and tailor-made exohedral cage functionalization and endohedral guest encapsulation). Therefore, such integrated hybrids have potential as multifunctional nanocarbon materials applicable, for example, in energy storage, electronic devices, solar cells, or advanced sensors. Recognizing these significant advantages, a series of methods and techniques has been developed to synthesize such integrated hybrids. Based on in-depth understanding of fullerene chemistry, interfullerene hybrids where multiple fullerenes are linked together have been synthesized and fully characterized. However, due to the difficulty in functionalizing graphene or CNTs as a result of their poor dispersibility and weak reactivity the corresponding hybrids including these macromolecular forms are less explored. Furthermore, few approaches toward such systems reported so far inevitably involve some drawbacks such as low degree of addition and low production ability.},
author = {Wei, Tao and Hauke, Frank and Hirsch, Andreas},
doi = {10.1021/acs.accounts.9b00181},
faupublication = {yes},
journal = {Accounts of Chemical Research},
note = {CRIS-Team WoS Importer:2019-09-13},
pages = {2037-2045},
peerreviewed = {Yes},
title = {{Covalent} {Inter}-{Synthetic}-{Carbon}-{Allotrope} {Hybrids}},
volume = {52},
year = {2019}
}
@article{faucris.243033594,
abstract = {Rational design and fabrication of graphene nanoarchitectures with multifunctionality and multidimensionality remains quite a challenge. Here, we present a synthetic sequence, based on the combination of two advanced patterned-functionalization principles, namely, laser-writing and poly(methyl methacrylate) (PMMA)-assisted lithographic processes, leading to unprecedented covalently doped graphene superlattices. Spatially resolved supratopic- and Janus-binding were periodically weaved on the graphene sheet, leading to four different types of zones with distinct chemical doping and structural properties. Notably, this is also the first realization of patterned Janus graphene. The elaborate chemical doping with micrometer resolution is unequivocally evidenced by scanning Raman spectroscopy (SRS) and scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy (SEM-EDS). The design of the pattern as well as the degree of chemical doping on both opposite sides of graphene can be easily manipulated, rendering exciting potential for graphene nanosystems.},
author = {Bao, Lipiao and Kohring, Malte and Weber, Heiko B. and Hauke, Frank and Hirsch, Andreas},
doi = {10.1021/jacs.0c07173},
faupublication = {yes},
journal = {Journal of the American Chemical Society},
note = {CRIS-Team Scopus Importer:2020-09-25},
pages = {16016-16022},
peerreviewed = {Yes},
title = {{Covalently} {Doped} {Graphene} {Superlattices}: {Spatially} {Resolved} {Supratopic}- and {Janus}-{Binding}},
volume = {142},
year = {2020}
}
@article{faucris.112048684,
abstract = {Attaching tetraphenyl porphyrins, with peripheral acetyl or malonate groups, to CN leads to the first covalently linked heterofullerene-porphyrin conjugates that exhibit long-lived intramolecular charge separation. © 2005 Elsevier Ltd. All rights reserved.},
author = {Hauke, Frank and Atalick, Stefan and Guldi, Dirk Michael and Hirsch, Andreas and Hauke, Frank},
doi = {10.1016/j.tet.2005.04.078},
faupublication = {yes},
journal = {Tetrahedron},
pages = {1923-1927},
peerreviewed = {Yes},
title = {{Covalently} linked heterofullerene-porphyrin conjugates; new model systems for long-lived intramolecular charge separation},
volume = {62},
year = {2006}
}
@article{faucris.120274044,
abstract = {The synthesis and characterization of sidewall-functionalized SWNT derivatives (nPrNH)-SWNTs containing n-propylamine addends is reported. The nucleophilic addition of in situ generated lithium n-propylamide to the sidewall of SWNTs and the subsequent reoxidation of charged intermediates of the type (nPrNH)-SWNT- leads to carbon nanotube derivatives with covalently attached amino groups. Based on the reaction sequence, a homogeneous dispersion of the carbon nanotube material is achieved as a result of the electrostatic repulsion of negatively charged intermediates. The solubility of the resulting propylamine-functionalized (nPrNH) -SWNT material in organic solvents is drastically increased. The functionalized tubes were characterized in detail by Raman spectroscopy, thermogravimetric analysis (TGA/MS), X-ray photoelectron spectroscopy (XPS) and UV/Vis/NIR spectroscopy. © Wiley-VCH Verlag GmbH & Co. KGaA, 2008.},
author = {Syrgiannis, Zois and Hauke, Frank and Röhrl, Jonas and Hundhausen, Martin and Graupner, Ralf and Elemes, Yiannis and Hirsch, Andreas},
doi = {10.1002/ejoc.200800005},
faupublication = {yes},
journal = {European Journal of Organic Chemistry},
pages = {2544-2550},
peerreviewed = {Yes},
title = {{Covalent} sidewall functionalization of {SWNTs} by nucleophilic addition of lithium amides},
year = {2008}
}
@article{faucris.123445344,
abstract = {Covalent functionalisation of graphene is a continuously progressing field of research. The optical properties of such derivatives attract particular attention. In virtually all optical responses, however, an enhancement in peak intensity with increase of sp3 carbon content, and a vanishing of the peak position shift in monolayer compared to few-layer systems, is observed. The understanding of these seemingly connected phenomena is lacking. Here we demonstrate, using Raman spectroscopy and in situ electrostatic doping techniques, that the intensity is directly modulated by an additional contribution from photoluminescent p-conjugated domains surrounded by sp3 carbon regions in graphene monolayers. The findings are further underpinned by a model which correlates the individual Raman mode intensities to the degree of functionalisation. We also show that the position shift in the spectra of solvent-based and powdered functionalised graphene derivatives originates predominantly from the presence of edge-to-edge and edge-to-basal plane interactions and is by large functionalisation independent.},
author = {Vecera, Philipp and Eigler, Siegfried and Kolesnik-Gray, Maria and Krstic, Vojislav and Vierck, Asmus and Maultzsch, Janina and Schafer, R and Hauke, Frank and Hirsch, Andreas},
doi = {10.1038/srep45165},
faupublication = {yes},
journal = {Scientific Reports},
peerreviewed = {Yes},
title = {{Degree} of functionalisation dependence of individual {Raman} intensities in covalent graphene derivatives},
volume = {7},
year = {2017}
}
@article{faucris.107589724,
abstract = {Ultrapure: The absolute purity of defect-free and structurally perfect single-walled carbon nanotubes in a bulk sample can be determined with density gradient ultracentrifugation (see picture). The experimental protocol offers a quick and reliable tool and is applicable to a broad variety of nanotube materials to evaluation production and purification procedures. Copyright © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.},
author = {Backes, Claudia and Bosch, Sebastian and Mundloch, Udo and Hauke, Frank and Hirsch, Andreas and Hauke, Frank},
doi = {10.1002/cphc.201100258},
faupublication = {yes},
journal = {ChemPhysChem},
pages = {2576-2580},
peerreviewed = {Yes},
title = {{Density} gradient ultracentrifugation on carbon nanotubes according to structural integrity as a foundation for an absolute purity evaluation},
volume = {12},
year = {2011}
}
@article{faucris.112669964,
abstract = {We report on the extensive characterization of single-walled carbon nanotubes (SWCNTs) dispersed in a variety of surfactants, such as sodium dodecyl benzene sulfonate (SDBS), sodium cholate (SC), and three synthesized perylene-based surfactants, by using differential sedimentation in H O and D O. Multidimensional evaluation of the absorption profiles over radius, wavelength, and time allows the determination of the anhydrous specific volumes of the SWCNT-surfactant complexes as well as the concentration of the surfactant reservoir in free micelles with very slow sedimentation coefficients (<1 Svedberg). Among the perylene bisimide surfactants, the smallest derivative is densely adsorbed on the nanotube backbone with an anhydrous specific volume significantly above that of SC or SDBS. Bulky Newkome dendritic groups on one or both ends of the perylene moiety gradually reduce the adsorption density, in accord with the absolute adsorption between 0.66 and 1.7 mmol surfactant per gram SWCNTs. Furthermore, hydrodynamic analysis reveals that SDBS favors the "tails-on" configuration. The distribution of sedimentation coefficients of SWCNTs prepared by high-pressure carbon monoxide decomposition (HiPco) is broader and shifted to faster sedimentation than those prepared by using cobalt-molybdenum catalysis (CoMoCAT), which reflects the polydispersity in diameter and length. Nanotube detergents: Deep insights into the arrangement of various surfactants noncovalently bound to the sidewall of single-walled carbon nanotubes (SWCNTs, see figure) have been obtained by analysis of the sedimentation coefficients with analytical ultracentrifugation. The investigation included classical detergents, as well as synthesized perylene-based surfactants. © 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.},
author = {Backes, Claudia and Karabudak, Engin and Schmidt, Cordula and Hauke, Frank and Hirsch, Andreas and Wohlleben, Wendel},
doi = {10.1002/chem.200903461},
faupublication = {yes},
journal = {Chemistry - A European Journal},
pages = {13176-13184},
peerreviewed = {Yes},
title = {{Determination} of the surfactant density on {SWCNTs} by analytical ultracentrifugation},
volume = {16},
year = {2010}
}
@article{faucris.108542544,
abstract = {Covalent functionalization of single-walled carbon nanotubes typically leads to an intensity increase of the defect-induced Raman mode (D mode). A large intensity ratio of the D and G modes (D/G ratio) is therefore often used as evidence for a successful functionalization. Here, we discuss the effect of the D mode resonance on the D/G ratio and compare pristine and covalently functionalized nanotubes. By resonance Raman spectroscopy we study the evolution of the lineshape and frequencies of the D and 2D modes of samples enriched with semiconducting and metallic nanotubes in comparison with the radial breathing mode. First, we experimentally demonstrate the dependence of the D- and 2D-mode frequencies on the tube diameter and derive an analytical expression for both frequencies as a function of the diameter and the optical transition. Furthermore, we demonstrate that the contribution of the D and 2D modes for small SWCNTs disappears in covalently functionalized samples due to partial destruction. In fact, this can change the measured D/G ratio significantly and has a fundamental impact on the determination of the degree of SWCNT functionalization by Raman spectroscopy. (C) 2016 Elsevier Ltd. All rights reserve},
author = {Laudenbach, Jan and Schmid, Daniel and Herziger, Felix and Frank, Hennrich and Kappes, Manfred and Muoth, M and Haluska, Miroslav and Hof, Ferdinand and Backes, Claudia and Hauke, Frank and Hirsch, Andreas and Maultzsch, Janina},
doi = {10.1016/j.carbon.2016.10.065},
faupublication = {yes},
journal = {Carbon},
pages = {1-7},
peerreviewed = {Yes},
title = {{Diameter} dependence of the defect-induced {Raman} modes in functionalized carbon nanotubes},
volume = {112},
year = {2017}
}
@article{faucris.106883084,
author = {Dasler, Daniela and Schäfer, Ricarda and Minameyer, Martin and Hitzenberger, Jakob and Hauke, Frank and Drewello, Thomas and Hirsch, Andreas},
doi = {10.1021/jacs.7b04122},
faupublication = {yes},
journal = {Journal of the American Chemical Society},
pages = {11760-11765},
peerreviewed = {Yes},
title = {{Direct} {Covalent} {Coupling} of {Porphyrins} to {Graphene}},
volume = {139},
year = {2017}
}
@article{faucris.247770096,
abstract = {Laser writing as a simple and straightforward method for covalent 2D patterning of graphene remains challenging. Here, we report a facile and efficient approach for a laser-induced 2D patterning of graphene utilizing silver trifluoroacetate, providing an unprecedented high degree of functionalization. The use of laser-triggered photolysis of silver trifluoroacetate to generate trifluoromethyl radicals, confined only to the laser-irradiated region, leads to the selective reaction of graphene, thereby completing direct laser writing on graphene toward a spatially resolved 2D-patterned architecture. This highly 2D-functionalized graphene is completely reversible. Furthermore, a more complex patterned graphene hybrid architecture was constructed, taking advantage of the simultaneously produced/patterned silver nanoparticles during the laser-writing process. Considering the simplicity of this approach and its ability to provide high degrees of functionalization, the prerequisite of 2D patterning of other 2D materials based on this method is provided.},
author = {Wei, Tao and Al-Fogra, Sabrin and Hauke, Frank and Hirsch, Andreas},
doi = {10.1021/jacs.0c11153},
faupublication = {yes},
journal = {Journal of the American Chemical Society},
note = {CRIS-Team Scopus Importer:2021-01-15},
pages = {21926–21931},
peerreviewed = {Yes},
title = {{Direct} {Laser} {Writing} on {Graphene} with {Unprecedented} {Efficiency} of {Covalent} {Two}-{Dimensional} {Functionalization}},
volume = {142},
year = {2020}
}
@article{faucris.112678984,
abstract = {Nanotube surfactant design: The dispersion of SWNTs by designed surfactants based on water-soluble pyrene derivatives is reported. Significantly, nanotubes with small diameters are depleted in the supernatant after centrifugation, presenting the foundation for future nanotube separation by selective dispersion Chemical Equation Presentation © 2010 Wiley-VCH Verlag GmbH&Co. KGaA.},
author = {Backes, Claudia and Mundloch, Udo and Ebel, Alexander and Hauke, Frank and Hirsch, Andreas},
doi = {10.1002/chem.200903420},
faupublication = {yes},
journal = {Chemistry - A European Journal},
keywords = {nanotubes;noncovalent functionalization;polycycles;selectivity;surfactants},
pages = {3314-3317},
peerreviewed = {Yes},
title = {{Dispersion} of {HiPco}® and {CoMoCAT}®single-walled nanotubes ({SWNTs}) by water soluble pyrene derivatives-depletion of small diameter {SWNTs}},
volume = {16},
year = {2010}
}
@article{faucris.107596104,
abstract = {The selective dispersion of single-walled carbon nanotube species (n,m) with conjugated polymers such as poly(9,9-dioctylfluorene) (PFO) and poly(9,9-dioctylfluorene-cobenzothiadiazole) (F8BT) in organic solvents depends not only on the type of solvent but also on the molecular weight of the polymer. We find an increasing amount of nanotubes and altered selectivities for dispersions with higher molecular weight polymers. Including the effects of different aromatic solvents, we propose that solution viscosity is one of the factors influencing the apparent selectivity by changing the reaggregation rate of the single-walled carbon nanotubes (SWNT). The type of solvent, polymer molecular weight, concentration, and viscosity should thus be taken into account when screening for new polymers for selective SWNT dispersion. © 2012 American Chemical Society.},
author = {Jakubka, Florian and Schießl, Stefan and Martin, Sebastian and Englert, Jan and Hauke, Frank and Hirsch, Andreas and Zaumseil, Jana},
doi = {10.1021/mz300147g},
faupublication = {yes},
journal = {ACS Macro Letters},
pages = {815-819},
peerreviewed = {Yes},
title = {{Effect} of polymer molecular weight and solution parameters on selective dispersion of single-walled carbon nanotubes},
volume = {1},
year = {2012}
}
@article{faucris.212873608,
abstract = {The puckered surface of black phosphorus represents an ideal substrate for an unconventional arrangement of physisorbed species and the resulting specific two-dimensional chemistry of this system. This opens the way to investigate the chemical and physical properties of locally confined areas of black phosphorus without the necessity for further physical downscaling of the material. We have evaporated tetracyanoquinodimethane (TCNQ) on top of black phosphorus under over-saturation non-equilibrium conditions in vacuum. The evolution of linear density and height of droplets formed through oxidation during exposure to air is studied time dependently by scanning-force microscopy. Our study suggests that the TCNQ molecules spontaneously arrange in a thin layer of the order of a few nm height, which, however, is fragmented with a periodicity of about 100nm. It is shown that within the confined space separating the layer fragments the chemical dynamics of the oxidation process is remarkably different than on a bare black phosphorus surface.},
author = {Meingast, Laura and Kolesnik-Gray, Maria and Siebert, Martin and Abellan Saez, Gonzalo and Wild, Stefan and Lloret Segura, Vicente Josep and Mundloch, Udo and Hauke, Frank and Hirsch, Andreas and Krstic, Vojislav},
doi = {10.1002/pssr.201800179},
faupublication = {yes},
journal = {Physica Status Solidi-Rapid Research Letters},
keywords = {black phosphorus;dynamics;oxidation;TCNQ},
peerreviewed = {Yes},
title = {{Effect} of {TCNQ} {Layer} {Cover} on {Oxidation} {Dynamics} of {Black} {Phosphorus}},
volume = {12},
year = {2018}
}
@article{faucris.201702271,
author = {Meingast, Laura and Kolesnik-Gray, Maria and Siebert, Martin and Abellán, Gonzalo and Wild, Stefan and Lloret, Vicent and Mundloch, Udo and Hauke, Frank and Hirsch, Andreas and Krstic, Vojislav},
doi = {10.1002/pssr.201800179},
faupublication = {yes},
journal = {Physica Status Solidi-Rapid Research Letters},
keywords = {Dynamics; Oxidation; Black phosphorus; TCNQ},
peerreviewed = {Yes},
title = {{Effect} of {TCNQ} {Layer} {Cover} on {Oxidation} {Dynamics} of {Black} {Phosphorus}},
year = {2018}
}
@article{faucris.106883964,
author = {Márkus, Bence G. and Simon, Ferenc and Nagy, Karoly and Fehér, Titusz and Wild, Stefan and Abellan Saez, Gonzalo and Chacón-Torres, Julio C. and Hirsch, Andreas and Hauke, Frank},
doi = {10.1002/pssb.201700232},
faupublication = {yes},
journal = {physica status solidi (b)},
keywords = {black phosphorus; conductivity; electronic properties; magnetic properties; magnetic resonances; Raman spectroscopy},
peerreviewed = {Yes},
title = {{Electronic} and {Magnetic} {Properties} of {Black} {Phosphorus}},
volume = {254},
year = {2017}
}
@article{faucris.212874260,
abstract = {Characterization of electronic properties of novel materials is of great importance for exploratory materials development and also for the discovery of new correlated phases. As several novel compounds are available in powder form only, contactless methods, which also work on air-sensitive samples, are highly desired. We present that the microwave cavity perturbation technique is a versatile tool to study conductivity in such systems. The examples include studies on semiconducting-metallic crossover in carbon nanotubes upon alkali doping, study of vortex motion in the K3C60 superconductor, and the characterization of various alkali atom doped phases of black phosphorus.},
author = {Márkus, Bence G. and Csösz, Gábor and Sági, Olivér and Gyüre-Garami, Balázs and Lloret Segura, Vicente Josep and Wild, Stefan and Abellan Saez, Gonzalo and Nemes, Norbert M. and Klupp, Gyöngyi and Kamarás, Katalin and Hirsch, Andreas and Hauke, Frank and Simon, Ferenc},
doi = {10.1002/pssb.201800250},
faupublication = {yes},
journal = {physica status solidi (b)},
keywords = {microwave conductivity;black phosphorus;carbon nanotubes;fullerides;intercalation},
peerreviewed = {Yes},
title = {{Electronic} {Properties} of {Air}-{Sensitive} {Nanomaterials} {Probed} with {Microwave} {Impedance} {Measurements}},
volume = {255},
year = {2018}
}
@article{faucris.124182124,
abstract = {We present resonant Raman measurements on single-walled carbon nanotubes (SWCNT) functionalized with propylamine groups at different degrees. Direct nucleophilic addition based on in situ generated primary amides is used for attaching n-propylamine to the sidewalls of SWCNTs. The influence of the amino functionalities on the electronic structure of the nanotubes is investigated. From the Raman resonance profiles of the radial breathing modes (RBMs), the chiral indices of the corresponding tubes are assigned. We observe significant redshifts of the transition energies and a broadening of the resonance windows due to chemical modification of SWCNTs. Similar redshifts are derived from the analysis of the NIR/Vis transmission spectrum. The relative Raman intensities of the functionalized samples and the evaluation of their transmission spectra indicate a diameter dependence of the reactivity as it has been observed for other moieties. By analyzing the defect induced D mode we observe a considerable degree of functionalization accompanied by an almost unharmed tube structure, which ensures that the observed effects are mainly driven by changes of the electronic structure.},
author = {Müller, Matthias and Meinke, Reinhard and Maultzsch, Janina and Syrgiannis, Zois and Hauke, Frank and Pekker, Áron and Kamarás, Katalin and Hirsch, Andreas and Thomsen, Christian},
doi = {10.1002/cphc.201000004},
faupublication = {yes},
journal = {ChemPhysChem},
pages = {2444-2448},
peerreviewed = {Yes},
title = {{Electronic} properties of propylamine-functionalized single-walled carbon nanotubes.},
volume = {11},
year = {2010}
}
@inproceedings{faucris.118583784,
address = {1305 Walt Whitman Road Suite 300 Melville, NY 11747-4300},
author = {Eisebitt, S. and Karl, A. and Zimina, A. and Scherer, R. and Freiwald, M. and Eberhardt, W. and Hauke, Frank and Hirsch, Andreas and Achiba, Y.},
booktitle = {Vol. 544 ELECTRONIC PROPERTIES OF NOVEL MATERIALS-MOLECULAR NANOSTRUCTURE},
date = {2000-03-04/2000-03-11},
doi = {10.1063/1.1342538},
editor = {Hans Kuzmany , Jörg Fink , Michael Mehring and Siegmar Roth},
faupublication = {yes},
pages = {380-384},
peerreviewed = {Yes},
publisher = {AIP Publishing LLC 1305 Walt Whitman Road Suite 300 Melville, NY 11747-4300},
title = {{Electronic} {Structure} of {Doped} {Fullerenes} and {Single} {Wall} {Carbon} {Nanotubes}},
url = {http://adsabs.harvard.edu/abs/2000AIPC..544..380E},
venue = {Kirchberg, Tirol},
year = {2000}
}
@article{faucris.117731944,
abstract = {Filling of single-wall carbon nanotubes with CN azafullerene derivatives is reported from toluene solvent at ambient temperature. The filling is characterized by high-resolution transmission electron microscopy and Raman spectroscopy. The filling efficiency is the same as for C fullerenes and the tube-azafullerene interaction is similar to the tube-C interaction. Vacuum annealing of the encapsulated azafullerene results in the growth of inner tubes, however no spectroscopic signature of nitrogen built in the inner walls is detected. © 2006 Elsevier Ltd. All rights reserved.},
author = {Hauke, Frank and Hirsch, Andreas and Simon, Ferenc and Kuzmany, Hans and Bernardi, Johannes},
doi = {10.1016/j.carbon.2006.02.001},
faupublication = {yes},
journal = {Carbon},
pages = {1958-1962},
peerreviewed = {Yes},
title = {{Encapsulating} {C59N} azafullerene derivatives inside single-wall carbon nanotubes},
volume = {44},
year = {2006}
}
@article{faucris.107665844,
abstract = {Filling of single-wall carbon nanotubes with CN azafullerene derivatives is reported from toluene solvent at ambient temperature. The filling is characterized by high resolution transmission electron microscopy and Raman spectroscopy. The tube-azafullerene interaction is similar to the tube-C interaction. The encapsulated CN monomer radical is observed using electron spin resonance spectroscopy after vacuum annealing of the azafullerene derivatives. © 2006 WILEY-VCH Verlag GmbH & Co. KGaA.},
author = {Simon, Ferenc and Kuzmany, Hans and Fülöp, Ferenc and Janossy, András and Bernardi, Johannes and Hauke, Frank and Hirsch, Andreas},
doi = {10.1002/pssb.200669200},
faupublication = {yes},
journal = {physica status solidi (b)},
pages = {3263-3267},
peerreviewed = {Yes},
title = {{Encapsulating} {C59N} azafullerenes inside single-wall carbon nanotubes},
volume = {243},
year = {2006}
}
@article{faucris.107603804,
abstract = {We present evidence from multiple characterization methods, such as emission spectroscopy, zeta potential, and analytical ultracentrifugation, to shed light on the adsorption behavior of synthesized perylene surfactants on single-walled carbon nanotubes (SWCNTs). On comparing dispersions of smaller-diameter SWCNTs prepared by using cobalt-molybdenum catalysis (CoMoCAT) with the larger-diameter SWCNTs prepared by high-pressure carbon monoxide decomposition (HiPco), we find that the CoMoCAT-perylene surfactant dispersions are characterized by more negative zeta potentials, and higher anhydrous specific volumes (the latter determined from the sedimentation coefficients by analytical ultracentrifugation), which indicates an increased packing density of the perylene surfactants on nanotubes of smaller diameter. This conclusion is further supported by the subsequent replacement of the perylene derivatives from the nanotube sidewall by sodium dodecyl benzene sulfonate (SDBS), which first occurs on the larger-diameter nanotubes. The enhanced adsorption affinity of the perylene surfactants towards smaller-diameter SWCNTs can be understood in terms of a change in the supramolecular arrangement of the perylene derivatives on the scaffold of the SWCNTs. These findings represent a significant step forward in understanding the noncovalent interaction of π-surfactants with carbon nanotubes, which will enable the design of novel surfactants with enhanced selectivity for certain nanotube species. Nanotube surfactant design: The interactions of synthesized perylene-based surfactants with single-walled carbon nanotubes (SWCNTs) of various diameters have been investigated. The surfactants exhibit an enhanced adsorption affinity towards smaller-diameter SWCNTs (see figure), which could be of great importance for future nanotube separation by selective dispersion. © 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.},
author = {Backes, Claudia and Mundloch, Udo and Schmidt, Cordula and Coleman, Jonathan N. and Wohlleben, Wendel and Hauke, Frank and Hirsch, Andreas},
doi = {10.1002/chem.201000232},
faupublication = {yes},
journal = {Chemistry - A European Journal},
pages = {13185-13192},
peerreviewed = {Yes},
title = {{Enhanced} adsorption affinity of anionic perylene-based surfactants towards smaller-diameter {SWCNTs}},
volume = {16},
year = {2010}
}
@article{faucris.120497124,
author = {von Delius, Max and Hauke, Frank and Hirsch, Andreas},
doi = {10.1002/ejoc.200800423},
faupublication = {yes},
journal = {European Journal of Organic Chemistry},
keywords = {fullerenes;heterofullerenes;azides;molecular modelling;1,3-dipolar cycloaddition},
pages = {4109-4119},
peerreviewed = {Yes},
title = {{Evaluation} of an intramolecular approach for the synthesis of the elusive {C}(58){N}(2) heterofullerene family},
year = {2008}
}
@article{faucris.107580924,
abstract = {A new donor-acceptor dyad (7) involving a ferrocene moiety as donor and an azafullerene as acceptor has been synthesized by treating bisazafullerenyl (1) with ferrocenium hexafluorophosphate. This compound represents the first example of a fullerene-based dyad where two electroactive groups are connected by only a single σ-bond. The cyclic voltammetry of 7, in comparison to the corresponding reference systems, clearly reveals strong electronic coupling between the ferrocene and the azafullerene moiety in the ground state. For example, the Fc-based, reversible, one electron oxidation wave is significantly positively shifted by 183 mV with respect to that of the parent ferrocene. This indicates the existence of intramolecular charge transfer (ICT) from the donating Fc to the accepting azafullerenyl group. Photophysical studies on 7 were carried out by means of emission and transient absorption spectroscopy. An instantaneous deactivation of the fullerene singlet excited-state results in the formation of the chargeseparated (CN)-(Fc) radical pair. From the charge-transfer dynamics with a lower limit of ≥ 5 × 10 s, we infer strong electronic coupling (V) between the azafullerene and the ferrocene moiety of the order of 60 cm in benzonitrile.},
author = {Hauke, Frank and Hirsch, Andreas and Liu, Sheng-Gao and Echegoyen, Luis and Swartz, Angela and Luo, Chuping and Guldi, Dirk Michael},
doi = {10.1002/1439-7641(20020215)3:2<195::AID-CPHC195>3.0.CO;2-C},
faupublication = {yes},
journal = {ChemPhysChem},
pages = {195-205},
peerreviewed = {Yes},
title = {{Evidence} of pronounced electronic coupling in a directly bonded fullerene-ferrocene dyad},
volume = {3},
year = {2002}
}
@article{faucris.264865095,
abstract = {The realization that nanostructured graphene featuring nanoscale width can confine electrons to open its bandgap has aroused scientists' attention to the regulation of graphene structures, where the concept of graphene patterns emerged. Exploring various effective methods for creating graphene patterns has led to the birth of a new field termed graphene patterning, which has evolved into the most vigorous and intriguing branch of graphene research during the past decade. The efforts in this field have resulted in the development of numerous strategies to structure graphene, affording a variety of graphene patterns with tailored shapes and sizes. The established patterning approaches combined with graphene chemistry yields a novel chemical patterning route via molecular engineering, which opens up a new era in graphene research. In this review, the currently developed graphene patterning strategies is systematically outlined, with emphasis on the chemical patterning. In addition to introducing the basic concepts and the important progress of traditional methods, which are generally categorized into top-down, bottom-up technologies, an exhaustive review of established protocols for emerging chemical patterning is presented. At the end, an outlook for future development and challenges is proposed.},
author = {Wei, Tao and Hauke, Frank and Hirsch, Andreas},
doi = {10.1002/adma.202104060},
faupublication = {yes},
journal = {Advanced Materials},
note = {CRIS-Team WoS Importer:2021-10-08},
peerreviewed = {Yes},
title = {{Evolution} of {Graphene} {Patterning}: {From} {Dimension} {Regulation} to {Molecular} {Engineering}},
year = {2021}
}
@article{faucris.107604904,
abstract = {Unsubstituted hexa-peri-hexabenzocoronene (HBC) - a small and well defined model system for graphite/graphene - was exfoliated and dissolved in water and the resulting individualized nano graphene sheets were characterized spectroscopically for the first time. © 2010 The Royal Society of Chemistry.},
author = {Englert, Jan and Hauke, Frank and Hirsch, Andreas and Feng, Xingliang and Müllen, Klaus},
doi = {10.1039/c0cc03849k},
faupublication = {yes},
journal = {Chemical Communications},
pages = {9194-9196},
peerreviewed = {Yes},
title = {{Exfoliation} of hexa-peri-hexabenzocoronene in water},
volume = {46},
year = {2010}
}
@article{faucris.215784379,
author = {Wabra, Isabell and Holzwarth, Johannes and Hauke, Frank and Hirsch, Andreas},
doi = {10.1002/chem.201805777},
faupublication = {yes},
journal = {Chemistry - A European Journal},
pages = {5186-5201},
peerreviewed = {Yes},
title = {{Exohedral} {Addition} {Chemistry} of the {Fullerenide} {Anions} {C602}− and {C60}⋅−},
volume = {25},
year = {2019}
}
@article{faucris.120032044,
author = {Abellan Saez, Gonzalo and Neiß, Christian and Lloret Segura, Vicente Josep and Wild, Stefan and Chacón-Torres, Julio C. and Werbach, Katharina and Fedi, Filippo and Shiozawa, Hidetsugu and Görling, Andreas and Peterlik, Herwig and Pichler, Thomas and Hauke, Frank and Hirsch, Andreas},
doi = {10.1002/anie.201707462},
faupublication = {yes},
journal = {Angewandte Chemie International Edition},
keywords = {alkali metals; black phosphorus; DFT calculations; intercalation compounds; Raman spectroscopy},
pages = {15267-15273},
peerreviewed = {Yes},
title = {{Exploring} the {Formation} of {Black} {Phosphorus} {Intercalation} {Compounds} with {Alkali} {Metals}},
volume = {56},
year = {2017}
}
@article{faucris.211476455,
abstract = {Group 15 elements in zero oxidation state (P, As, Sb and Bi), also called pnictogens, are rarely used in catalysis due to the difficulties associated in preparing well-structured and stable materials. Here, we report on the synthesis of highly exfoliated, few layer 2D phosphorene and antimonene in zero oxidation state, suspended in an ionic liquid, with the native atoms ready to interact with external reagents while avoiding aerobic or aqueous decomposition pathways, and on their use as efficient catalysts for the alkylation of nucleophiles with esters. The few layer pnictogen material circumvents the extremely harsh reaction conditions associated to previous superacid-catalyzed alkylations, by enabling an alternative mechanism on surface, protected from the water and air by the ionic liquid. These 2D catalysts allow the alkylation of a variety of acid-sensitive organic molecules and giving synthetic relevancy to the use of simple esters as alkylating agents.},
author = {Lloret Segura, Vicente Josep and Angel Rivero-Crespo, Miguel and Alejandro Vidal-Moya, Jose and Wild, Stefan and Domenech-Carbo, Antonio and Heller, Bettina and Shin, Sunghwan and Steinrück, Hans-Peter and Maier, Florian and Hauke, Frank and Varela, Maria and Hirsch, Andreas and Leyva-Perez, Antonio and Abellan Saez, Gonzalo},
doi = {10.1038/s41467-018-08063-3},
faupublication = {yes},
journal = {Nature Communications},
month = {Jan},
note = {CRIS-Team WoS Importer:2019-02-21},
peerreviewed = {Yes},
title = {{Few} layer {2D} pnictogens catalyze the alkylation of soft nucleophiles with esters},
volume = {10},
year = {2019}
}
@article{faucris.119875404,
abstract = {We report on a fast and simple method to produce highly stable isopropanol/water (4:1) suspensions of few-layer antimonene by liquid-phase exfoliation of antimony crystals in a process that is assisted by sonication but does not require the addition of any surfactant. This straightforward method generates dispersions of few-layer antimonene suitable for on-surface isolation. Analysis by atomic force microscopy, scanning transmission electron microscopy, and electron energy loss spectroscopy confirmed the formation of high-quality few-layer antimonene nanosheets with large lateral dimensions. These nanolayers are extremely stable under ambient conditions. Their Raman signals are strongly thickness-dependent, which was rationalized by means of density functional theory calculations.},
author = {Gibaja, Carlos and Rodriguez-San-Miguel, David and Ares, Pablo and Gomez-Herrero, Julio and Varela, Maria and Gillen, Roland and Maultzsch, Janina and Hauke, Frank and Hirsch, Andreas and Abellan Saez, Gonzalo and Zamora, Felix},
doi = {10.1002/anie.201605298},
faupublication = {yes},
journal = {Angewandte Chemie International Edition},
keywords = {Antimonene; Atomic force microscopy; Liquid-phase exfoliation; Raman spectroscopy; Two-dimensional materials},
pages = {14345-14349},
peerreviewed = {Yes},
title = {{Few}-{Layer} {Antimonene} by {Liquid}-{Phase} {Exfoliation}},
volume = {55},
year = {2016}
}
@article{faucris.235588376,
abstract = {The substitution of catalytic metals by p-block main elements has a tremendous impact not only in the fundamentals but also in the economic and ecological fingerprint of organic reactions. Here we show that few-layer black phosphorous (FL-BP), a recently discovered and now readily available 2D material, catalyzes different radical additions to alkenes with an initial turnover frequency (TOF0) up to two orders of magnitude higher than representative state-of-the-art metal complex catalysts at room temperature. The corresponding electron-rich BP intercalation compound (BPIC) KP6 shows a nearly twice TOF0 increase with respect to FL-BP. This increase in catalytic activity respect to the neutral counterpart also occurs in other 2D materials (graphene vs. KC8) and metal complex catalysts (Fe-0 vs. Fe2- carbon monoxide complexes). This reactive parallelism opens the door for cross-fertilization between 2D materials and metal catalysts in organic synthesis.},
author = {Tejeda-Serrano, Maria and Lloret, Vicent and Markus, Bence G. and Simon, Ferenc and Hauke, Frank and Hirsch, Andreas and Domenech-Carbo, Antonio and Abellán, Gonzalo and Leyva-Perez, Antonio},
doi = {10.1002/cctc.201902276},
faupublication = {yes},
journal = {ChemCatChem},
note = {CRIS-Team WoS Importer:2020-03-10},
peerreviewed = {Yes},
title = {{Few}-layer {Black} {Phosphorous} {Catalyzes} {Radical} {Additions} to {Alkenes} {Faster} than {Low}-valence {Metals}},
year = {2020}
}
@article{faucris.230066289,
abstract = {In this work, we present a systematic investigation on the regioselectivity and topicity of radical hydrogenation/alkylation of graphene. The complex process of sequential covalent binding of hydrogen and methyl radicals to the edges and basal plane of graphene, and addition to the direct neighborhood of pre-existing defects were quantitatively investigated using different computational techniques. Considering both thermodynamic and kinetic factors a general model for graphene functionalization has been developed. Based on the proposed model we performed numerical Monte-Carlo simulations, which provide evidence of a fractal expansion of functionalized regions leading to a fractal-seaweeds type of addition. We show that the applications of the model is widespread and includes the description of Birch-like hydrogenation, reductive alkylation and direct radical addition, which allows to evaluate the effect of the size, shape and the quality of a graphene flake on the addition morphology.},
author = {Amsharov, Konstantin and Sharapa, Dmitry I. and Vasilyev, Oleg A. and Martin, Oliver and Hauke, Frank and Görling, Andreas and Soni, Himadriben and Hirsch, Andreas},
doi = {10.1016/j.carbon.2019.11.008},
faupublication = {yes},
journal = {Carbon},
keywords = {Functionalization regioselectiviy; Graphene; Topicity},
note = {CRIS-Team Scopus Importer:2019-12-03},
peerreviewed = {Yes},
title = {{Fractal}-seaweeds type functionalization of graphene},
year = {2020}
}
@article{faucris.112955744,
abstract = {HiPco and CoMoCAT single-walled carbon nanotubes (SWCNT) were fractionated with the aid of a novel perylene bisimide surfactant by combined co-surfactant and replacement density gradient ultracentrifugation (DGU). © The Royal Society of Chemistry 2009.},
author = {Backes, Claudia and Hauke, Frank and Schmidt, Cordula and Hirsch, Andreas},
doi = {10.1039/b818141a},
faupublication = {yes},
journal = {Chemical Communications},
pages = {2643-2645},
peerreviewed = {Yes},
title = {{Fractioning} {HiPco} and {CoMoCAT} {SWCNTs} via density gradient ultracentrifugation by the aid of a novel perylene bisimide derivative surfactant},
year = {2009}
}
@article{faucris.112546544,
abstract = {The singlet and triplet excited state properties of a series of fullerene derivatives (C) are compared to those of the corresponding heteroazafullerenes derivatives (CN) by employing a variety of steady-state and time-resolved photophysical assays. The most far-reaching results infer that the CN (2, 5) analogous of C (1, 4) are characterized by shorter singlet lifetimes (1.01/0.57 ns versus 1.80/1.75 ns) and weaker fluorescence quantum yields (1.6 × 10/2.1 × 10 versus 6.0 × 10/1.09 × 10). This general conclusion applies for the monoadduct series (1, 2) and also for the highly functionalized hexaadducts (4, 5). Similarly, higher singlet energies (1.89 eV (4) versus 1.79 eV (1)) come together with higher fluorescence quantum yields for the hexaadducts than for the monoadducts.},
author = {Guldi, Dirk Michael and Hirsch, Andreas and Hauke, Frank},
doi = {10.1163/15685670260469438},
faupublication = {yes},
journal = {Research on Chemical Intermediates},
pages = {817-830},
peerreviewed = {Yes},
title = {{Fullerenes} ({C60}) versus heteroazafullerenes ({C59N}); a photophysical comparison of their monoadducts and hexaadducts},
volume = {28},
year = {2002}
}
@article{faucris.120266344,
abstract = {The reaction of Na/K-reduced graphite with hexyliodide represents a new, versatile and mild approach to synthesize alkylated graphene derivatives, which were characterized by a combination of Raman spectroscopy, TEM and TGA/MS analysis. © The Royal Society of Chemistry 2012.},
author = {Englert, Jan and Knirsch, Kathrin and Dotzer, Christoph and Butz, Benjamin and Hauke, Frank and Hirsch, Andreas and Spiecker, Erdmann},
doi = {10.1039/c2cc31181j},
faupublication = {yes},
journal = {Chemical Communications},
pages = {5025-5027},
peerreviewed = {Yes},
title = {{Functionalization} of graphene by electrophilic alkylation of reduced graphite},
volume = {48},
year = {2012}
}
@incollection{faucris.120755844,
author = {Graupner, Ralf and Hauke, Frank},
booktitle = {Oxford Handbook of Nanoscience and Technology},
doi = {10.1093/oxfordhb/9780199533046.013.16},
faupublication = {yes},
isbn = {9780191859250},
pages = {508-548},
peerreviewed = {unknown},
publisher = {Oxford University Press},
series = {Oxford Handbook},
title = {{Functionalization} of single-walled carbon nanotubes: {Chemistry} and characterization},
volume = {Volume 1: Basic Aspects},
year = {2010}
}
@article{faucris.123508044,
abstract = {Herein, we have developed a systematic study on the oxidation and passivation of mechanically exfoliated black phosphorus (BP). We analyzed the strong anisotropic behavior of BP by scanning Raman microscopy providing an accurate method for monitoring the oxidation of BP-via statistical Raman spectroscopy. Furthermore, different factors influencing the environmental instability of the BP, i.e., thickness, lateral dimensions or visible light illumination, have been investigated in detail. Finally, we discovered that the degradation of few-layer BP flakes of <10 nm can be suppressed for months by using ionic liquids, paving the way for the development of BP-based technologie},
author = {Abellan, Gonzalo and Wild, Stefan and Lloret, Vicent and Scheuschner, Nils and Gillen, Roland and Mundloch, Udo and Maultzsch, Janina and Varela, Maria and Hauke, Frank and Hirsch, Andreas},
doi = {10.1021/jacs.7b04971},
faupublication = {yes},
journal = {Journal of the American Chemical Society},
pages = {10432-10440},
peerreviewed = {Yes},
title = {{Fundamental} {Insights} into the {Degradation} and {Stabilization} of {Thin} {Layer} {Black} {Phosphorus}},
volume = {139},
year = {2017}
}
@article{faucris.106866804,
abstract = {Single-walled carbon nanotubes (SWCNT) have been covalently cross-linked via a reductive functionalization pathway, utilizing negatively charged carbon nanotubides (KC4). We have compared the use of difunctional linkers acting as molecular pillars between the nanotubes, namely p-diiodobenzene, p-diiodobiphenyl as well as benzene-4,4’-bis(diazonium) and 1,1’-biphenyl-4,4’-bis(diazonium) salts as electrophiles. We have employed statistical Raman spectroscopy (SRS), a forefront characterization tool consisting of thermogravimetric analysis coupled with gas chromatography and mass spectrometry (TG-GC-MS), and aberration-corrected high resolution transmission electron microscopy image series at 80kV to unambiguously demonstrate the covalent binding of the molecular linkers. The present study shows that the SWCNT functionalization using iodide derivatives leads to the best results in terms of bulk functionalization homogeneity (Hbulk) and degree of addition. Phenylene linkers yield the highest degree of functionalization, whereas biphenylene units induce a higher surface area with an increase in the thermal stability and an improved electrochemical performance in the oxygen reduction reaction (ORR). This work illustrates the importance of molecular engineering in the design of novel functional materials and provides important insights into the understanding of basic principles of reductive cross-linking of carbon nanotube},
author = {Schirowski, Milan and Abellan Saez, Gonzalo and Nuin Pla, Neus Edurne and Pampel, Jonas and Dolle, Christian and Wedler, Vincent and Fellinger, Tim-Patrick and Spiecker, Erdmann and Hauke, Frank and Hirsch, Andreas},
doi = {10.1021/jacs.7b12910},
faupublication = {yes},
journal = {Journal of the American Chemical Society},
keywords = {cross-linking, SWCNT, covalent functionalization, diazonium salt, TG-MS},
peerreviewed = {Yes},
title = {{Fundamental} {Insights} into the {Reductive} {Covalent} {Cross}-{Linking} of {Single}-{Walled} {Carbon} {Nanotubes}},
year = {2018}
}
@article{faucris.274167214,
author = {Bao, Lipiao and Zhao, Baolin and Ali, Muhammad and Assebban, M'hamed and Yang, Bowen and Kohring, Malte and Ryndyk, Dmitry A. and Heine, Thomas and Weber, Heiko B. and Halik, Marcus and Hauke, Frank and Hirsch, Andreas},
doi = {10.1002/admi.202200425},
faupublication = {yes},
journal = {Advanced Materials Interfaces},
peerreviewed = {Yes},
title = {{Hierarchical} {Assembly} and {Sensing} {Activity} of {Patterned} {Graphene}-{Hamilton} {Receptor} {Nanostructures}},
year = {2022}
}
@article{faucris.234061151,
abstract = {Patterned graphene-functionalization with a tunable degree of functionalization can tailor the properties of graphene. Here, we present a new reductive functionalization approach combined with lithography rendering patterned graphene-functionalization easily accessible. Two types of covalent patterning of graphene were prepared and their structures were unambiguously characterized by statistical Raman spectroscopy together with scanning electron microscopy/energy-dispersive X-ray spectroscopy (SEM-EDS). The reversible defunctionalization processes, as revealed by temperature-dependent Raman spectroscopy, enable the possibility to accurately modulate the degree of functionalization by annealing. This allows for the management of chemical information through complete write/store/erase cycles. Based on our strategy, controllable and efficient patterning graphene-functionalization is no longer a challenge and facilitates the development of graphene-based devices.},
author = {Wei, Tao and Kohring, Malte and Chen, Muqing and Yang, Shangfeng and Weber, Heiko B. and Hauke, Frank and Hirsch, Andreas},
doi = {10.1002/anie.201914088},
faupublication = {yes},
journal = {Angewandte Chemie International Edition},
month = {Jan},
note = {CRIS-Team WoS Importer:2020-02-11},
peerreviewed = {Yes},
title = {{Highly} {Efficient} and {Reversible} {Covalent} {Patterning} of {Graphene}: {2D}-{Management} of {Chemical} {Information}},
year = {2020}
}
@article{faucris.111703064,
abstract = {Liquid-phase exfoliated few-layer graphene flakes are noncovalently functionalized with tailor-made cationic water-soluble perylene diimides. By using a straightforward dip-coating approach, homogeneous ultrathin films consisting of interpenetrated nanoarchitectures can be achieved by incorporation of anionic ZnO nanoparticles. These 0D/2D assemblies pave the way for the development of novel graphene-based composite materials.},
author = {Marcia, Mario and Vinh, Chau and Dolle, Christian and Abellan Saez, Gonzalo and Schönamsgruber, Jörg and Schunk, Torsten and Butz, Benjamin and Spiecker, Erdmann and Hauke, Frank and Hirsch, Andreas},
doi = {10.1002/admi.201600365},
faupublication = {yes},
journal = {Advanced Materials Interfaces},
keywords = {graphene; hybrid materials; layer-by-layer assembly; nanoparticles; supramolecular chemistry},
peerreviewed = {Yes},
title = {{Highly} {Integrated} {Organic}–{Inorganic} {Hybrid} {Architectures} by {Noncovalent} {Exfoliation} of {Graphite} and {Assembly} with {Zinc} {Oxide} {Nanoparticles}},
volume = {3},
year = {2016}
}
@article{faucris.106884844,
author = {Holzwarth, Johannes and Amsharov, Konstantin and Sharapa, Dmitry and Reger, David and Roshchyna, Kateryna and Lungerich, Dominik and Jux, Norbert and Hauke, Frank and Clark, Timothy and Hirsch, Andreas},
doi = {10.1002/anie.201706437},
faupublication = {yes},
journal = {Angewandte Chemie International Edition},
keywords = {alkylation; density-functional calculations; graphene; radicals; reaction mechanisms},
pages = {12184-12190},
peerreviewed = {Yes},
title = {{Highly} {Regioselective} {Alkylation} of {Hexabenzocoronenes}: {Fundamental} {Insights} into the {Covalent} {Chemistry} of {Graphene}},
volume = {56},
year = {2017}
}
@article{faucris.107639444,
abstract = {The aqueous dispersion of SWCNTs in the presence of the water-soluble perylene derivatives 1 -3 is reported. Significantly, even very low concentrations of the perylenes such as 0.01 wt% of the amphiphilic derivative 3, cause an efficient dissolution of the SWCNTs in water accompanied by a very pronounced individualization. The individualization of SWCNTs in water after ultrasonication in the presence of water-soluble aromatic perylenes was investigated in detail by absorption, emission, and Raman spectroscopy as well as by AFM and cryo-TEM. These studies also revealed that the individualization of the SWCNTs caused by the adsorption of 3 is much more effective than that induced by SDBS, which is the most frequently used surfactant for SWCNT dispersion in water. The π-π-stacking interaction and the electronic interaction between the perylene unit and the nanotube surface is reflected, for example, by the distinct absorption and emission features in the UV/vis/nIR, which differ significantly from those observed for SWNTs dispersed in the presence of SDBS and by the quenching of the perylene fluorescence of 3 when being in contact with the tubes. © 2009 American Chemical Society.},
author = {Backes, Claudia and Schmidt, Cordula and Hauke, Frank and Böttcher, Christoph and Hirsch, Andreas and Hauke, Frank},
doi = {10.1021/ja805660b},
faupublication = {yes},
journal = {Journal of the American Chemical Society},
pages = {2172-2184},
peerreviewed = {Yes},
title = {{High} population of individualized {SWCNTs} through the adsorption of water-soluble perylenes},
volume = {131},
year = {2009}
}
@article{faucris.261337141,
abstract = {Rational patterning and tailoring of graphene relies on the disclosure of suitable reagents for structuring the target functionalities on the 2D-carbon network. Here, a series of hypervalent iodine compounds, namely, 1-chloro-1,2-benziodoxol-3(1H)-one, 1,3-dihydro-1-hydroxy-3,3-dimethyl-1,2-benziodoxole, and 3,3-dimethyl-1-(trifluoromethyl)-1,2-benziodoxole is reported to be extremely efficient for a diversified graphene patterning. The decomposition of these compounds generates highly reactive Cl, OH, and CF3 radicals exclusively in the irradiated areas, which subsequently attach onto the graphene leading to locally controlled chlorination, hydroxylation, and trifluoromethylation, respectively. This is the first realization of a patterned hydroxylation of graphene, and the degrees of functionalization of the patterned chlorination and trifluoromethylation are both unprecedented. The usage of these mild reagents here is reasonably facile compared to the reported methods using hazardous Cl-2 or ICl and allows for sophisticated pattern designs with nanoscale precision, promising for arbitrary nanomanipulation of graphene's properties like hydrophilicity and conductivity by the three distinct functionalities (Cl, OH, and CF3). Moreover, the attachment of functional entities to these highly functionalized graphene nanoarchitectures is fully reversible upon thermal annealing, enabling a full writing/storing/reading/erasing control over the chemical information stored within graphene. This work provides an exciting clue for target 2D functionalization and modulation of graphene by using suitable hypervalent iodine compounds.},
author = {Bao, Lipiao and Zhao, Baolin and Yang, Bowen and Halik, Marcus and Hauke, Frank and Hirsch, Andreas},
doi = {10.1002/adma.202101653},
faupublication = {yes},
journal = {Advanced Materials},
note = {CRIS-Team WoS Importer:2021-07-09},
peerreviewed = {Yes},
title = {{Hypervalent} {Iodine} {Compounds} as {Versatile} {Reagents} for {Extremely} {Efficient} and {Reversible} {Patterning} of {Graphene} with {Nanoscale} {Precision}},
year = {2021}
}
@article{faucris.249970045,
abstract = {Two-dimensional (2D) black phosphorus (BP) represents one of the most appealing 2D materials due to its electronic, optical, and chemical properties. Many strategies have been pursued to face its environmental instability, covalent functionalization being one of the most promising. However, the extremely low functionalization degrees and the limitations in proving the nature of the covalent functionalization still represent challenges in many of these sheet architectures reported to date. Here we shine light on the structural evolution of 2D-BP upon the addition of electrophilic diazonium salts. We demonstrated the absence of covalent functionalization in both the neutral and the reductive routes, observing in the latter case an unexpected interface conversion of BP to red phosphorus (RP), as characterized by Raman, P-31-MAS NMR, and X-ray photoelectron spectroscopies (XPS). Furthermore, thermogravimetric analysis coupled to gas chromatography and mass spectrometry (TG-GC-MS), as well as electron paramagnetic resonance (EPR) gave insights into the potential underlying radical mechanism, suggesting a Sandmeyer-like reaction.},
author = {Mitrovic, Aleksandra and Wild, Stefan and Lloret, Vicent and Fickert, Michael and Assebban, M'hamed and Markus, Bence G. and Simon, Ferenc and Hauke, Frank and Abellán, Gonzalo and Hirsch, Andreas},
doi = {10.1002/chem.202003584},
faupublication = {yes},
journal = {Chemistry - A European Journal},
month = {Jan},
note = {CRIS-Team WoS Importer:2021-02-19},
peerreviewed = {Yes},
title = {{Interface} {Amorphization} of {Two}-{Dimensional} {Black} {Phosphorus} upon {Treatment} with {Diazonium} {Salts}},
year = {2021}
}
@article{faucris.224994707,
abstract = {A multipurpose interconnection layer based on poly(3,4-ethylenedioxythiophene) doped with poly(styrene sulfonate) (PEDOT:PSS), and d-sorbitol for monolithic perovskite/silicon tandem solar cells is introduced. The interconnection of independently processed silicon and perovskite subcells is a simple add-on lamination step, alleviating common fabrication complexities of tandem devices. It is demonstrated experimentally and theoretically that PEDOT:PSS is an ideal building block for manipulating the mechanical and electrical functionality of the charge recombination layer by controlling the microstructure on the nano- and mesoscale. It is elucidated that the optimal functionality of the recombination layer relies on a gradient in the d-sorbitol dopant distribution that modulates the orientation of PEDOT across the PEDOT:PSS film. Using this modified PEDOT:PSS composite, a monolithic two-terminal perovskite/silicon tandem solar cell with a steady-state efficiency of 21.0%, a fill factor of 80.4%, and negligible open circuit voltage losses compared to single-junction devices is shown. The versatility of this approach is further validated by presenting a laminated two-terminal monolithic perovskite/organic tandem solar cell with 11.7% power conversion efficiency. It is envisioned that this lamination concept can be applied for the pairing of multiple photovoltaic and other thin film technologies, creating a universal platform that facilitates mass production of tandem devices with high efficiency.},
author = {Ramírez Quiroz, César Omar and Spyropoulos, Georgios and Salvador, Michael and Roch, Loïc M. and Berlinghof, Marvin and Darío Perea, José and Forberich, Karen and Dion-Bertrand, Laura Isabelle and Schrenker, Nadine J. and Classen, Andrej and Gasparini, Nicola and Chistiakova, Ganna and Mews, Mathias and Korte, Lars and Rech, Bernd and Li, Ning and Hauke, Frank and Spiecker, Erdmann and Ameri, Tayebeh and Albrecht, Steve and Abellán, Gonzalo and León, Salvador and Unruh, Tobias and Hirsch, Andreas and Aspuru-Guzik, Alán and Brabec, Christoph},
doi = {10.1002/adfm.201901476},
faupublication = {yes},
journal = {Advanced Functional Materials},
keywords = {density functional theory; lamination; molecular dynamics; monolithic tandem; perovskite/silicon; transparent-conductive-adhesive},
pages = {1901476},
peerreviewed = {Yes},
title = {{Interface} {Molecular} {Engineering} for {Laminated} {Monolithic} {Perovskite}/{Silicon} {Tandem} {Solar} {Cells} with 80.4% {Fill} {Factor}},
volume = {29},
year = {2019}
}
@article{faucris.120247424,
abstract = {The complementary use of steady-state and time-resolved spectroscopy in combination with electrochemistry and microscopy are indicative of mutual interactions between semiconducting SWNTs and a water-soluble strong electron acceptor, i.e., perylenediimide. Significant is the stability and the strong electronic coupling of the perylenediimide/SWNT electron donor-acceptor hybrids. Several spectroscopic and spectroelectrochemical techniques, i.e., Raman, absorption, and fluorescence, confirmed that distinct ground- and excited-state interactions occur and that kinetically and spectroscopically well characterized radical ion pair states form within a few picoseconds. © 2011 American Chemical Society.},
author = {Oelsner, Christian and Schmidt, Cordula and Hauke, Frank and Prato, Maurizio and Hirsch, Andreas and Guldi, Dirk Michael and Hauke, Frank},
doi = {10.1021/ja1108744},
faupublication = {yes},
journal = {Journal of the American Chemical Society},
pages = {4580-4586},
peerreviewed = {Yes},
title = {{Interfacing} strong electron acceptors with single wall carbon nanotubes},
volume = {133},
year = {2011}
}
@article{faucris.120058884,
author = {Nuin Pla, Neus Edurne and Lloret Segura, Vicente Josep and Amsharov, Konstantin and Hauke, Frank and Abellan Saez, Gonzalo and Hirsch, Andreas},
doi = {10.1002/chem.201705872},
faupublication = {yes},
journal = {Chemistry - A European Journal},
keywords = {Graphene; Isomers; Noncovalent functionalization; Perylene; π conjugation},
pages = {4671-4679},
peerreviewed = {Yes},
title = {{Isomerically} {Pure} {Star}-{Shaped} {Triphenylene}-{Perylene} {Hybrids} {Involving} {Highly} {Extended} π-{Conjugation}},
volume = {24},
year = {2018}
}
@article{faucris.215786547,
author = {Wild, Stefan and Fickert, Michael and Mitrovic, Aleksandra and Lloret Segura, Vicente Josep and Neiß, Christian and Alejandro Vidal-Moya, Jose and Angel Rivero-Crespo, Miguel and Leyva-Perez, Antonio and Werbach, Katharina and Peterlik, Herwig and Grabau, Mathias and Wittkämper, Haiko and Papp, Christian and Steinrück, Hans-Peter and Pichler, Thomas and Görling, Andreas and Hauke, Frank and Abellan Saez, Gonzalo and Hirsch, Andreas},
doi = {10.1002/anie.201811181},
faupublication = {yes},
journal = {Angewandte Chemie International Edition},
pages = {5763-5768},
peerreviewed = {Yes},
title = {{Lattice} {Opening} upon {Bulk} {Reductive} {Covalent} {Functionalization} of {Black} {Phosphorus}},
volume = {58},
year = {2019}
}
@article{faucris.109743084,
abstract = {Few-layer black phosphorus (BP) is a new two-dimensional material which is of great interest for applications, mainly in electronics. However, its lack of environmental stability severely limits its synthesis and processing. Here we demonstrate that high-quality, few-layer BP nanosheets, with controllable size and observable photoluminescence, can be produced in large quantities by liquid phase exfoliation under ambient conditions in solvents such as N-cyclohexyl-2-pyrrolidone (CHP). Nanosheets are surprisingly stable in CHP, probably due to the solvation shell protecting the nanosheets from reacting with water or oxygen. Experiments, supported by simulations, show reactions to occur only at the nanosheet edge, with the rate and extent of the reaction dependent on the water/oxygen content. We demonstrate that liquid-exfoliated BP nanosheets are potentially useful in a range of applications from ultrafast saturable absorbers to gas sensors to fillers for composite reinforcement.},
author = {Hanlon, Damien and Backes, Claudia and Doherty, Evie and Cucinotta, Clotilde S. and Berner, Nina and Boland, Conor and Lee, Kangho and Harvey, Andrew and Lynch, Peter and Gholamvand, Zahra and Zhang, Saifeng and Wang, Kangpeng and Moynihan, Glenn and Pokle, Anuj and Ramasse, Quentin M. and McEvoy, Niall and Blau, Werner J. and Wang, Jun and Hauke, Frank and Hirsch, Andreas and Abellan Saez, Gonzalo and Sanvito, Stefano and O’Regan, David D. and Duesberg, Georg S. and Nicolosi, Valeria and Coleman, Jonathan N.},
doi = {10.1038/ncomms9563},
faupublication = {yes},
journal = {Nature Communications},
peerreviewed = {Yes},
title = {{Liquid} exfoliation of solvent-stabilized few-layer black phosphorus for applications beyond electronics},
volume = {6},
year = {2015}
}
@article{faucris.213512770,
abstract = {Direct exfoliation of a carbonate layered double hydroxide (LDH) has been achieved by using a novel horn-probe sonic tip, avoiding the development of time-consuming anion-exchange reactions. The most suitable solvents were chosen based on the Hildebrand solubility parameters and the thickness of the exfoliated nanosheets confirmed unambiguously the successful delamination.},
author = {Carrasco, Jose and Harvey, Andrew and Hanlon, Damien and Lloret Segura, Vicente Josep and McAteer, Dave and Sanchis-Gual, Roger and Hirsch, Andreas and Hauke, Frank and Abellan Saez, Gonzalo and Coleman, Jonathan N. and Coronado, Eugenio},
doi = {10.1039/C9CC00197B},
faupublication = {yes},
journal = {Chemical Communications},
pages = {3315-3318},
peerreviewed = {Yes},
title = {{Liquid} phase exfoliation of carbonate-intercalated layered double hydroxides},
volume = {55},
year = {2019}
}
@article{faucris.123395404,
abstract = {A versatile, scaleable, one step synthesis of a lower rim mono-functionalized resorcinarene is described.},
author = {Hauke, Frank and Myles, Andrew and Rebek, Julius},
doi = {10.1039/b506048f},
faupublication = {no},
journal = {Chemical Communications},
pages = {4164-6},
peerreviewed = {Yes},
title = {{Lower} rim mono-functionalization of resorcinarenes.},
year = {2005}
}
@article{faucris.109826904,
abstract = {C59N magnetic fullerenes were formed inside single-wall carbon nanotubes by vacuum annealing functionalized C59N molecules encapsulated inside the tubes. A hindered, anisotropic rotation of C59N was deduced from the temperature dependence of the electron spin resonance spectra near room temperature. Shortening of the spin-lattice relaxation time T1 of C59N indicates a reversible charge transfer toward the host nanotubes above ∼350K. Bound C59N-C60 heterodimers are formed at lower temperatures when C60 is coencapsulated with the functionalized C59N. In the 10-300 K range, T1 of the heterodimer shows a relaxation dominated by the conduction electrons on the nanotubes. © 2006 The American Physical Society.},
author = {Simon, Ferenc and Kuzmany, Hans and Nafradi, Balint and Fehér, Titusz and Forro, Lásló and Fülöp, Ferenc and Janossy, András and Korecz, Laszlo and Rockenbauer, Antal and Hauke, Frank and Hirsch, Andreas and Hauke, Frank},
doi = {10.1103/PhysRevLett.97.136801},
faupublication = {yes},
journal = {Physical Review Letters},
peerreviewed = {Yes},
title = {{Magnetic} fullerenes inside single-wall carbon nanotubes},
volume = {97},
year = {2006}
}
@article{faucris.120237744,
abstract = {Single-wall carbon nanotubes (SWNTs) are emerging as materials with much potential in several disciplines, in particular in electronics and photovoltaics. The combination of SWNTs with electron donors or acceptors generates active materials, which can produce electrical energy when irradiated. However, SWNTs are very elusive species when characterization of their metastable states is required. This problem mainly arises because of the polydispersive nature of SWNT samples and the inevitable presence of SWNTs in bundles of different sizes. Here, we report the complete and thorough characterization of an SWNT radical ion-pair state induced by complexation with a perylene dye, which combines excellent electron-accepting and-conducting features with a five-fused ring-system. At the same time, the perylene dye enables the dispersion of SWNTs by means of- interactions, which gives individual SWNTs in solution. This work clears a path towards electronic and optoelectronic devices in which regulated electrical transport properties are important. © 2009 Macmillan Publishers Limited. All rights reserved.},
author = {Ehli, Christian and Oelsner, Christian and Guldi, Dirk Michael and Mateo-Alonso, Aurelio and Prato, Maurizio and Schmidt, Cordula and Backes, Claudia and Hauke, Frank and Hirsch, Andreas and Hauke, Frank},
doi = {10.1038/nchem.214},
faupublication = {yes},
journal = {Nature Chemistry},
pages = {243-249},
peerreviewed = {Yes},
title = {{Manipulating} single-wall carbon nanotubes by chemical doping and charge transfer with perylene dyes},
volume = {1},
year = {2009}
}
@article{faucris.120310344,
abstract = {The thermal treatment of the heterofullerene dimer (CN) with ketones and aldehydes in the presence of TsOH and air leads to Mannich-type functionalized heterofullerenes RCN.},
author = {Hauke, Frank and Hirsch, Andreas and Hauke, Frank},
doi = {10.1039/a906711f},
faupublication = {yes},
journal = {Chemical Communications},
pages = {2199-2200},
peerreviewed = {Yes},
title = {{Mannich} functionalization of {C59N}},
year = {1999}
}
@article{faucris.120267444,
abstract = {We demonstrate random network single-walled carbon nanotube (SWNT) field-effect transistors (FETs) in bottom contact/top gate geometry with only five different semiconducting nanotube species that were selected by dispersion with poly(9,9-dioctylfluorene) in toluene. These FETs are highly ambipolar with balanced hole and electron mobilities and emit near-infrared light with narrow peak widths (<40 meV) and good efficiency. We spatially resolve the electroluminescence from the channel region during a gate voltage sweep and can thus trace charge transport paths through the SWNT thin film. A shift of emission intensity to large diameter nanotubes and gate-voltage-dependent photoluminescence quenching of the different nanotube species indicates excitation transfer within the network and preferential charge accumulation on small band gap nanotubes. Apart from applications as near-infrared emitters with selectable emission wavelengths and narrow line widths, these devices will help to understand and model charge transport in realistic carbon nanotube networks. © 2013 American Chemical Society.},
author = {Jakubka, Florian and Backes, Claudia and Gannott, Florentina and Mundloch, Udo and Hauke, Frank and Hirsch, Andreas and Zaumseil, Jana},
doi = {10.1021/nn403419d},
faupublication = {yes},
journal = {Acs Nano},
pages = {7428-7435},
peerreviewed = {Yes},
title = {{Mapping} charge transport by electroluminescence in chirality-selected carbon nanotube networks},
volume = {7},
year = {2013}
}
@article{faucris.237698866,
abstract = {Avoiding and removing surface contamination is a crucial task when handling specimens in any scientific experiment. This is especially true for two-dimensional materials such as graphene, which are extraordinarily affected by contamination due to their large surface area. While many efforts have been made to reduce and remove contamination from such surfaces, the issue is far from resolved. Here we report on an in situ mechanical cleaning method that enables the site-specific removal of contamination from both sides of two dimensional membranes down to atomic-scale cleanliness. Further, mechanisms of re-contamination are discussed, finding surface-diffusion to be the major factor for contamination in electron microscopy. Finally the targeted, electron-beam assisted synthesis of a nanocrystalline graphene layer by supplying a precursor molecule to cleaned areas is demonstrated.},
author = {Schweizer, Peter and Dolle, Christian and Dasler, Daniela and Abellán, Gonzalo and Hauke, Frank and Hirsch, Andreas and Spiecker, Erdmann},
doi = {10.1038/s41467-020-15255-3},
faupublication = {yes},
journal = {Nature Communications},
note = {CRIS-Team Scopus Importer:2020-04-24},
pages = {1743-},
peerreviewed = {Yes},
title = {{Mechanical} cleaning of graphene using in situ electron microscopy},
volume = {11},
year = {2020}
}
@article{faucris.205676711,
abstract = {In this study, Melamine functionalized graphene oxide (FGO-Melamine) was synthesized by chemical route. The prepared functionalized graphene oxide was characterized by different analytical techniques such as
FT-IR, Raman spectroscopy, thermogravimetry coupled with mass
spectrometry (TG-MS), X-Ray diffraction (XRD), field-emission scanning
electron microscopy (FE-SEM), and X-ray photoelectron spectroscopy
(XPS). To improve electrochemical properties of polyorthoaminophenol (POAP), the electropolymerized POAP/FGO-Melamine films, employed as an active electrode
regarding electrochemical performance. In terms of electrochemical
measurements, galvanostatic charge–discharge evaluation, EIS
(electrochemical impedance spectroscopy) and CV (cyclic voltammetry)
were employed for conducting an enquiry into supercapacitive performance
of nanocomposite of POAP/FGO-Melamine. This graphene-based electrode showed a specific capacitance (SC) by 273 F g−1 and high energy of 37.91 W kg−1 at power density of 500 W kg−1.
The novel materials synthesized in the current work show higher
efficiency compared to the carbon-based ones concerning redox reactions
of capacitors consisting of good stability in the existence of aqueous
electrolyte, large active surface area and ease synthesis method. © 2018 Elsevier B.},
author = {Ajdari, Farshad Boorboor and Kowsari, Elaheh and Ehsani, Ali and Chepyga, Liudmyla and Schirowski, Milan and Jaeger, Sebastian and Kasian, Olga and Hauke, Frank and Ameri, Tayebeh},
doi = {10.1016/j.apsusc.2018.07.215},
faupublication = {yes},
journal = {Applied Surface Science},
keywords = {Functionalized graphene oxide; Supercapacitor; Characterization; Synthesis},
pages = {874-883},
peerreviewed = {Yes},
title = {{Melamine}-functionalized graphene oxide: {Synthesis}, characterization and considering as pseudocapacitor electrode material with intermixed {POAP} polymer},
volume = {459},
year = {2018}
}
@article{faucris.107651544,
abstract = {CN magnetic fullerenes inside single-wall carbon nanotubes (SWCNTs) are used to probe the density of states (DOS) on the host tubes using electron spin resonance (ESR). The CN radicals are separated by C fullerenes to prevent dimerization and CN-C heterodimers are formed at low temperatures. The electron spin-lattice relaxation time, T, of the heterodimers is deduced from the homogeneous ESR line-width. The analysis is supported by saturation ESR studies. The inverse of the heterodimer T follows a linear behavior in the 20-300 K temperature range, the so-called Korringa law, evidencing a metallic DOS on all tubes in a bundle. © 2007 WILEY-VCH Verlag GmbH & Co. KGaA.},
author = {Simon, Ferenc and Quintavalle, Dario and Janossy, András and Nafradi, Balint and Forro, Lásló and Kuzmany, Hans and Hauke, Frank and Hirsch, Andreas and Mende, Jens and Mehring, Michael},
doi = {10.1002/pssb.200776174},
faupublication = {yes},
journal = {physica status solidi (b)},
pages = {3885-3889},
peerreviewed = {Yes},
title = {{Metallic} bundles of single-wall carbon nanotubes probed by electron spin resonance},
volume = {244},
year = {2007}
}
@article{faucris.212871724,
author = {Wei, Tao and Martin, Oliver and Yang, Shangfeng and Hauke, Frank and Hirsch, Andreas},
doi = {10.1002/anie.201811864},
faupublication = {yes},
journal = {Angewandte Chemie International Edition},
pages = {816-820},
peerreviewed = {Yes},
title = {{Modular} {Covalent} {Graphene} {Functionalization} with {C60} and the {Endohedral} {Fullerene} {Sc3N}@{C80}: {A} {Facile} {Entry} to {Synthetic}-{Carbon}-{Allotrope} {Hybrids}},
volume = {58},
year = {2019}
}
@article{faucris.248437288,
author = {Wei, Tao and Kohring, Malte and Weber, Heiko B. and Hauke, Frank and Hirsch, Andreas},
doi = {10.1038/s41467-020-20651-w},
faupublication = {yes},
journal = {Nature Communications},
peerreviewed = {Yes},
title = {{Molecular} embroidering of graphene},
volume = {12},
year = {2021}
}
@article{faucris.120235324,
abstract = {The electrophilic attack of CN on arenes such as pyrene, coronene and corannulene leads to the regioselective formation of fullerene conjugates, in which polycyclic aromatics are connected to the spherical heterofullerene by a single σ-bond.},
author = {Hauke, Frank and Atalick, Stefan and Guldi, Dirk Michael and Mack, James and Scott, Lawrence and Hirsch, Andreas and Hauke, Frank},
doi = {10.1039/B316139K},
faupublication = {yes},
journal = {Chemical Communications},
pages = {766-767},
peerreviewed = {Yes},
title = {{Molecular} satellite dishes: {Attaching} parabolic and planar arenes to heterofullerenes},
volume = {10},
year = {2004}
}
@article{faucris.277136064,
abstract = {The sequentialverticalpolyfunctionalizationof 2D addend-patternedgrapheneis still elusive.Here,we reporta practicalrealizationof this goalvia a “molecularbuildingblocks”approach,whichis basedon a combinationof alithography-assistedreductivefunctionalizationapproachanda post-functionalizationstepto sequentiallyandcontrollablylink the molecularbuildingblocksethylpyridine,cis-dichlorobis(2,2’-bipyridyl)ruthenium,and triphenyl-phosphine(4-methylbenzenethiol,respectively)on selectedlatticeregionsof a graphenematrix.The assembled2Dhetero-architecturesare unambiguouslycharacterizedby variousspectroscopicand microscopicmeasurements,revealingthe stepwisestackingof the molecularbuildingblockson the graphenesurface.Our methodovercomesthe currentlimitationof a one-layer-onlybindingto the graphenesurfaceand opensthe doorfor a verticalgrowthin the z-directio},
author = {Wei, Tao and Liu, Xin and Kohring, Malte and Al-Fogra, Sabrin and Moritz, Michael and Hemmeter, Daniel and Paap, Ulrike and Papp, Christian and Steinrück, Hans-Peter and Bachmann, Julien and Weber, Heiko B. and Hauke, Frank and Hirsch, Andreas},
doi = {10.1002/anie.202201169},
faupublication = {yes},
journal = {Angewandte Chemie International Edition},
peerreviewed = {Yes},
title = {{Molecular} {Stacking} on {Graphene}},
url = {https://onlinelibrary.wiley.com/doi/epdf/10.1002/anie.202201169},
year = {2022}
}
@article{faucris.122523324,
abstract = {For the first time, the bisfunctionalization of graphene by employing two successive reduction and covalent bond forming steps is reported. Bulk functionalization in dispersion and functionalization of individual sheets deposited on surfaces have both been carried out. Whereas in the former case attacks from both sides of the basal plane are possible and can lead to strain-free architectures, in the latter case, retrofunctionalizations can become important when the corresponding anion of the addend is a sufficiently good leaving group.},
author = {Knirsch, Kathrin and Schäfer, Ricarda and Hauke, Frank and Hirsch, Andreas},
doi = {10.1002/anie.201511807},
faupublication = {yes},
journal = {Angewandte Chemie International Edition},
keywords = {functionalization;graphene;Raman spectroscopy;retrofunctionalization;topicity},
pages = {5861-5864},
peerreviewed = {Yes},
title = {{Mono}- and {Ditopic} {Bisfunctionalization} of {Graphene}},
volume = {55},
year = {2016}
}
@article{faucris.211519818,
abstract = {We report a straightforward chemical methodology for controlling the thickness of black phosphorus flakes down to the monolayer limit by layer-by-layer oxidation and thinning, using water as solubilizing agent. Moreover, the oxidation process can be stopped at will by two different passivation procedures, namely the non-covalent functionalization with perylene diimide chromophores, which prevents the photooxidation, or by using a protective ionic liquid layer. The obtained flakes preserve their electronic properties as demonstrated by fabricating a BP field-effect transistor (FET). This work paves the way for the preparation of BP devices with controlled thickness.},
author = {Wild, Stefan and Lloret, Vicent and Vega-Mayoral, Victor and Vella, Daniele and Nuin, Edurne and Siebert, Martin and Kolesnik-Gray, Maria and Loeffler, Mario and Mayrhofer, Karl J. J. and Gadermaier, Christoph and Krstic, Vojislav and Hauke, Frank and Abellán, Gonzalo and Hirsch, Andreas},
doi = {10.1039/c8ra09069f},
faupublication = {yes},
journal = {RSC Advances},
month = {Jan},
note = {CRIS-Team WoS Importer:2019-02-21},
pages = {3570-3576},
peerreviewed = {Yes},
title = {{Monolayer} black phosphorus by sequential wet-chemical surface oxidation},
volume = {9},
year = {2019}
}
@article{faucris.120312764,
abstract = {We have synthesised nine monomeric azaheterofullerene (AZA) derivatives, RCN, with a wide variety of different side chains R and investigated their spectroscopic and photophysical properties in toluene and o-dichlorobenzene (ODCB). Measurements include their ground-state absorption spectra, molar absorption coefficient (ε), fluorescence spectra, fluorescence quantum yields (Φ), singlet-state lifetimes (τ), triplet-state absorption spectra, triplet molar absorption coefficients (ε), singlet oxygen (Φ), and triplet state (Φ) quantum yields. The replacement of a carbon by a nitrogen atom in the C sphere strongly affects most of the spectroscopic and photophysical properties. The chemical nature of the R moiety has definite effects on these properties in contrast with minor effects on the chemical nature of the addends in [6,6]-ring bridged monoadduct methano[60]fullerene derivatives. These effects concern properties of the ground state, singlet excited state, and triplet states of our nine RCN derivatives and in particular the values of photophysical parameters ε ε, Φ, and Φ, which are significantly lower than those of analogous monoadduct [6,6]-ring bridged methano[60]fullerene derivatives. © 2006 Wiley-VCH Verlag GmbH & Co. KGaA.},
author = {Hauke, Frank and Vostrowsky, Otto and Hirsch, Andreas and Quaranta, Annamaria and Leibl, Winfried and Leach, Sydney and Edge, Ruth and Navaratnam, Suppiah and Bensasson, René V. and Hauke, Frank},
doi = {10.1002/chem.200501536},
faupublication = {yes},
journal = {Chemistry - A European Journal},
pages = {4813-4820},
peerreviewed = {Yes},
title = {{Monomeric} azaheterofullerene derivatives {RC59N}: {Influence} of the {R} moiety on spectroscopic and photophysical properties},
volume = {12},
year = {2006}
}
@article{faucris.120268544,
abstract = {The synthesis of perylene-based single-walled carbon nanotube (SWCNT) surfactants and the dispersion and exfoliation of SWCNTs in water by a variety of designed surfactants is investigated. The quality of the nanotube dispersions is evaluated by optical absorption and emission spectroscopy, zeta-potential measurements and statistical atomic force microscopy (AFM). Significantly the dispersion efficiency can be increased at higher pH, as water solubility of the surfactants is ensured by peripheral derivatization with carboxyl-functionalized first and second-order Newkome dendrimers. Even at very low perylene concentrations of 0.1 g L and a nanotube-to-surfactant ratio of 1:1, the nanotube supernatant after centrifugation contains up to 73% of the pristine material with exfoliation degrees (the number of fractions of individualized nanotubes N/N) of up to 76%. The adsorption of the perylene core to the nanotube scaffold is indicated by red-shifted perylene-absorption and SWCNT-emission features except for the smallest perylene amphiphile, where solubilization is presumably based on a micellar arrangement The nanotube fluorescence is significantly altered and reduced in intensity compared to nanotubes dispersed in sodium dodecylbenzene sulfonate (SDBS) being strongly dependent on the structure of the perylene surfactant. We attribute this observation to the homogeneity of the surfactant coverage, e.g., the supramolecular arrangement onto the nanotube backbone. This study represents a step forward in understanding the structure-property relationship of nanotube surfactants. Furthermore high-quality nanotube dispersions with increased degrees of exfoliation are highly desirable, as the efficiency of nanotube separation techniques relies on highly individualized samples. © 2010 WILEY-VCH Verlag GmbH & Co. KGaA.},
author = {Backes, Claudia and Schmidt, Cordula and Rosenlehner, Karin and Hauke, Frank and Hirsch, Andreas and Coleman, Jonathan N.},
doi = {10.1002/adma.200902525},
faupublication = {yes},
journal = {Advanced Materials},
pages = {788-802},
peerreviewed = {Yes},
title = {{Nanotube} surfactant design: {The} versatility of water-soluble perylene bisimides},
volume = {22},
year = {2010}
}
@article{faucris.114702544,
abstract = {A water soluble naphthalenebisimide derivative (NBI) was synthesized and probed to individualize, suspend, and stabilize single wall carbon nanotubes (SWCNTs). Besides a comprehensive photophysical and electrochemical characterization of NBI, stable suspensions of SWCNTs were realized in buffered D2O. Overall, the dispersion efficiency of the NBI surfactant was determined by comparison with naphthalene based references. Successful individualization of SWCNTs was corroborated in several microscopic assays. In addition, emission spectroscopy points to the strong quenching of SWCNT centered band gap emission, when NBIs are immobilized onto SWCNTs. The origin of the quenching was found to be strong electronic communication, which leads to charge separation between NBIs and photoexcited SWCNTs, and, which yields reduced NBIs as well oxidized SWCNTs. Notably, electrochemical considerations revealed that the energy content of these charge separated states is one of the highest reported for SWCNT based electron donor-acceptor hybrids so far.},
author = {Dirian, Konstantin and Backes, Susanne and Backes, Claudia and Strauß, Volker and Rodler, Fabian and Hauke, Frank and Guldi, Dirk Michael and Hirsch, Andreas},
doi = {10.1039/c5sc02944a},
faupublication = {yes},
journal = {Chemical Science},
month = {Jan},
pages = {6886-6895},
peerreviewed = {Yes},
title = {{Naphthalenebisimides} as photofunctional surfactants for {SWCNTs} - towards water-soluble electron donor-acceptor hybrids},
volume = {6},
year = {2015}
}
@article{faucris.120292304,
abstract = {The formation and decay of negative molecular ions of azafullerenes and their hydrogenated derivatives are investigated by mass spectrometry. The mechanisms of resonant electron capture and the lifetimes of negative molecular ions with respect to the electron autodetachment in azafullerene molecules are discussed, A comparative analysis of the data obtained for azafullerenes and hydrogenated fullerene derivatives is carried out. © 2002 MAIK "Nauka/Interperiodica".},
author = {Vasil’ev, Yu and Abzalimov, R. and Nasibullaev, Sh. and Tuktarov, R. and Hauke, Frank and Reuther, Uwe and Hirsch, Andreas and Drewello, Thomas},
doi = {10.1134/1.1462705},
faupublication = {yes},
journal = {Physics of the Solid State},
pages = {554-556},
peerreviewed = {Yes},
title = {{Negative} molecular ions of azafullerenes and their hydrogenated derivatives},
volume = {44},
year = {2002}
}
@article{faucris.107794984,
abstract = {The reactivity of reduced single walled carbon nanotubes (SWCNTs) (carbon nanotubides), prepared under strict inert conditions in a glovebox with respect to the covalent functionalization with hexyl iodide and subsequent exposure to ambient conditions (air, moisture), was systematically investigated by Raman, absorption, fluorescence, and IR spectroscopy as well as by TG/MS measurements. We have discovered that the alkylation does not lead to a complete discharging of the tubes since follow-up reactions with moisture still take place leading to mixed functionalized carbon nanotube derivatives containing H- and OH-addends (but no carboxylates) next to the hexyl groups. This was confirmed by the exposure of carbon nanotubides to ambient conditions. The degree of hexylation determined both under strict inert (ic) and ambient (ac) conditions increases with an increasing K:C ratio of the reduced SWCNT starting material. The presence of OH-groups covalently attached to the nanotubes was also confirmed by postfunctionalization reactions with 2-thiophenecarbonyl chloride, leading to the corresponding esters. Control experiments with KO give rise to the formation of the same oxygen functionalities. These combined findings allowed for the suggestions of a plausible reaction mechanism, describing all the observed reactions on the SWCNTs side walls. The amount of subsequent side reactions after the treatment of reduced SWCNTs with electrophiles is strongly influenced by the reduction potential of the electrophile, which is responsible for the extent of reoxidation. Incomplete quenching of negative charges allows stronger oxidants/electrophile (e.g., O) to perform follow-up reactions. © 2013 American Chemical Societ},
author = {Hof, Ferdinand and Bosch, Sebastian and Eigler, Siegfried and Hauke, Frank and Hirsch, Andreas},
doi = {10.1021/ja4063713},
faupublication = {yes},
journal = {Journal of the American Chemical Society},
pages = {18385-18395},
peerreviewed = {Yes},
title = {{New} basic insight into reductive functionalization sequences of single walled carbon nanotubes ({SWCNTs})},
volume = {135},
year = {2013}
}
@article{faucris.112816924,
abstract = {Mutual attraction: π-π bonding promotes electronic interactions between graphene and a π-conjugated perylene in a liquid dispersion. Copyright © 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.},
author = {Kozhemyakina, Nina and Englert, Jan and Yang, Guang and Spiecker, Erdmann and Schmidt, Cordula and Hauke, Frank and Hirsch, Andreas and Spiecker, Erdmann},
doi = {10.1002/adma.201003206},
faupublication = {yes},
journal = {Advanced Materials},
pages = {5483-5487},
peerreviewed = {Yes},
title = {{Non}-covalent chemistry of graphene: {Electronic} communication with dendronized perylene bisimides},
volume = {22},
year = {2010}
}
@article{faucris.106885064,
author = {Abellan Saez, Gonzalo and Ares, Pablo and Wild, Stefan and Nuin Pla, Neus Edurne and Neiß, Christian and Rodriguez-San Miguel, David and Segovia, Pilar and Gibaja, Carlos and Michel, Enrique G. and Görling, Andreas and Hauke, Frank and Gomez-Herrero, Julio and Hirsch, Andreas and Zamora, Felix},
doi = {10.1002/anie.201702983},
faupublication = {yes},
journal = {Angewandte Chemie International Edition},
keywords = {antimonene; charge transfer; electron microscopy; phosphorus; surface chemistry},
pages = {14389-14394},
peerreviewed = {Yes},
title = {{Noncovalent} {Functionalization} and {Charge} {Transfer} in {Antimonene}},
volume = {56},
year = {2017}
}
@article{faucris.243939943,
abstract = {Amongst the different existing methods to passivate black phosphorus (BP) from environmental degradation, the noncovalent functionalization with perylene diimides (PDI) has been postulated as one of the most promising routes because it allows preserving its electronic properties. This work describes the noncovalent functionalization and outstanding environmental protection of BP with tailor made PDI having peri-amide aromatic side chains, which include phenyl and naphthyl groups, exhibiting a significantly increased molecule-BP interaction. These results are rationalized by density functional theory (DFT) calculations showing that the adsorption energies are mainly governed by van der Waals (vdW) interactions and increase concomitantly with the aromatic character of the side chains. The resulting hybrids are thoroughly characterized showing enhanced ambient and thermal stabilities. Last but not least, hybrid organic–inorganic BP-PDI field effect transistors (FETs) are studied for the first time showing the usefulness of PDI derivatives as efficient passivation layers while obtaining improved values of electron mobilities. These results pave the way for the use of optimized PDIs by molecular engineering to preserve the electronic properties of BP FETs, using straightforward wet chemical approaches.},
author = {Lloret, Vicent and Nuin, Edurne and Kohring, Malte and Wild, Stefan and Löffler, Mario and Neiß, Christian and Krieger, Michael and Hauke, Frank and Görling, Andreas and Weber, Heiko B. and Abellán, Gonzalo and Hirsch, Andreas},
doi = {10.1002/admi.202001290},
faupublication = {yes},
journal = {Advanced Materials Interfaces},
keywords = {black phosphorus; noncovalent functionalization; organic field effect transistors; perylene diimides},
note = {CRIS-Team Scopus Importer:2020-10-16},
peerreviewed = {Yes},
title = {{Noncovalent} {Functionalization} and {Passivation} of {Black} {Phosphorus} with {Optimized} {Perylene} {Diimides} for {Hybrid} {Field} {Effect} {Transistors}},
year = {2020}
}
@article{faucris.106737004,
abstract = {Black phosphorus (BP) was functionalized with organic moieties on the basis of liquid exfoliation. The treatment of BP with electron-withdrawing 7,7,8,8-tetracyano-p-quinodimethane (TCNQ) led to electron transfer from BP to the organic dopant. On the other hand, the noncovalent interaction of BP with a perylene diimide was mainly due to van der Waals interactions but also led to considerable stabilization of the BP flakes against oxygen degradation.},
author = {Abellan Saez, Gonzalo and Lloret Segura, Vicente Josep and Mundloch, Udo and Marcia, Mario and Neiß, Christian and Görling, Andreas and Varela, Maria and Hauke, Frank and Hirsch, Andreas},
doi = {10.1002/anie.201604784},
faupublication = {yes},
journal = {Angewandte Chemie-International Edition},
keywords = {Black phosphorus; Charge transfer; Functionalization; Noncovalent interactions; Stability},
pages = {14557 –14562},
peerreviewed = {unknown},
title = {{Noncovalent} {Functionalization} of {Black} {Phosphorus}},
volume = {55},
year = {2016}
}
@article{faucris.113314564,
abstract = {The synthesis, characterization and metal complexation of a new class of perylene bisimides (PBIs) as an integral part of ethylenediaminetetraacetic acid (EDTA) are reported. The simplest representative, namely derivative 1a, was synthesized both by a convergent as well as a direct approach while the elongated derivatives, 1b and 1c, were obtained only via a convergent synthetic pathway. All these new prototypes of water-soluble perylenes are bolaamphiphiles and were fully characterized by H-1- and C-13-NMR spectroscopy, matrix assisted laser desorption ionization-time of flight (MALDI-TOF) mass spectrometry and IR spectroscopy. In order to acquaint ourselves with the behaviour in solution of our PBIs bearing dendritic wedges, the simplest derivative, 1a, was chosen and tested by means of UV/Vis and fluorescence spectroscopy as well as by zeta-potential measurements. A photoexcitation induced intramolecular photo-electron transfer (PET) can be observed in these molecules. Therefore their potential applications as sensors can be imagined. Model compound 1a efficiently coordinates trivalent metal cations both in water and dimethyl sulfoxide (DMSO). Significantly, the effects of the complexation strongly depend on the aggregation state of the PBI molecules in solution. As a matter of fact, in water, the presence of M3+ ions triggers the formation of light emitting supramolecular aggregates (excimers). On the other hand, in DMSO-rich solutions metal complexation leads to the suppression of the PET and leads to a strong fluorescence enhancement.},
author = {Marcia, Mario and Singh, Prabhpreet and Hauke, Frank and Maggini, Michele and Hirsch, Andreas},
doi = {10.1039/c4ob01007h},
faupublication = {yes},
journal = {Organic & Biomolecular Chemistry},
month = {Jan},
pages = {7045-7058},
peerreviewed = {Yes},
title = {{Novel} {EDTA}-ligands containing an integral perylene bisimide ({PBI}) core as an optical reporter unit},
volume = {12},
year = {2014}
}
@article{faucris.120497344,
abstract = {The covalent functionalization of carbon allotropes represents a main topic in the growing field of nano materials. However, the development of functional architectures is impeded by the intrinsic polydispersibility of the respective starting material, the unequivocal characterization of the introduced functional moieties, and the exact determination of the degree of functionalization. Based on a novel carbon allotrope functionalization reaction, utilizing lambda(3)-iodanes as radical precursor systems, we were able to demonstrate the feasibility to separate and to quantify thermally detached functional groups, formerly covalently linked to carbon nanotubes and graphene through thermogravimetric GC-MS.},
author = {Hof, Ferdinand and Schäfer, Ricarda and Weiß, Cornelius and Hauke, Frank and Hirsch, Andreas},
doi = {10.1002/chem.201404662},
faupublication = {yes},
journal = {Chemistry - A European Journal},
keywords = {analytical chemistry;carbon allotropes;graphene;hypervalent iodine;nanotubes},
pages = {16644-16651},
peerreviewed = {Yes},
title = {{Novel} λ(3)-iodane-based functionalization of synthetic carbon allotropes ({SCAs})-common concepts and quantification of the degree of addition},
volume = {20},
year = {2014}
}
@article{faucris.107623824,
abstract = {Chemistry meets graphane: A Birch-type reaction using frozen water as a gentle proton source causes the exfoliation of graphite and formation of hydrogenated graphene with electronically decoupled π-nanodomains. This highly functionalized graphene displays pronounced fluorescence. Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinhei},
author = {Schäfer, Ricarda and Englert, Jan and Wehrfritz, Peter and Bauer, Walter and Hauke, Frank and Seyller, Thomas and Hirsch, Andreas},
doi = {10.1002/anie.201206799},
faupublication = {yes},
journal = {Angewandte Chemie International Edition},
keywords = {carbon allotropes;fluorescence;graphane;graphene;hydrogenation},
month = {Jan},
pages = {754-757},
peerreviewed = {Yes},
title = {{On} the way to graphane - {Pronounced} fluorescence of polyhydrogenated graphene},
volume = {52},
year = {2013}
}
@article{faucris.107624924,
abstract = {The optical bright- and dark-field visualization (see image) of single-walled carbon nanotubes spin-casted onto Si/SiO2 substrates with a 300-nm-thick oxide coating is reported. This novel procedure gives access to a low-cost correlation of Raman spectroscopy with microscopic techniques (atomic force microscopy, scanning electron microscopy) greatly facilitating nanotube characterization.},
author = {Backes, Claudia and Englert, Jan and Bernhard, Nicolas and Hauke, Frank and Hirsch, Andreas and Hauke, Frank},
doi = {10.1002/smll.201001019},
faupublication = {yes},
journal = {Small},
pages = {1968-1973},
peerreviewed = {Yes},
title = {{Optical} visualization of carbon nanotubes-a unifying linkage between microscopic and spectroscopic characterization techniques},
volume = {6},
year = {2010}
}
@article{faucris.212875714,
abstract = {Field-effect transistors (FETs) with non-covalently functionalised molybdenum disulfide (MoS2) channels grown by chemical vapour deposition (CVD) on SiO2 are reported. The dangling-bond-free surface of MoS2 was functionalised with a perylene bisimide derivative to allow for the deposition of Al2O3 dielectric. This allowed the fabrication of top-gated, fully encapsulated MoS2 FETs. Furthermore, by the definition of vertical contacts on MoS2, devices, in which the channel area was never exposed to polymers, were fabricated. The MoS2 FETs showed some of the highest mobilities for transistors fabricated on SiO2 with Al2O3 as the top-gate dielectric reported so far. Thus, gate-stack engineering using innovative chemistry is a promising approach for the fabrication of reliable electronic devices based on 2D materials.},
author = {Kim, HyunJeong and Kim, WungYeon and O'Brien, Maria and Mcevoy, Niall and Yim, Chanyoung and Marcia, Mario and Hauke, Frank and Hirsch, Andreas and Kim, Gyu-Tae and Duesberg, Georg},
doi = {10.1039/c8nr02134a},
faupublication = {yes},
journal = {Nanoscale},
pages = {17557-17566},
peerreviewed = {Yes},
title = {{Optimized} single-layer {MoS2} field-effect transistors by non-covalent functionalisation},
volume = {10},
year = {2018}
}
@article{faucris.212876941,
abstract = {Controlled covalent functionalization of graphene remains a challenging task owing to the heterogeneous nature of materials. Functionalization approaches for graphene either lack in quantifying the degree of functionalization or they do not discriminate between covalent and non-covalent functionalization. Here, graphite is oxidized and exfoliated in a three-step procedure and subsequently reduced and functionalized by hexylation. Although Raman spectroscopy is powerful to determine the degree of in-plane lattice defects (theta(LD)) and functionalization (theta(FD)), the method fails at detecting introduced hexyl groups at a concentration of about 0.03%, next to the pre-existing in-plane lattice defects of 0.7%. However, sensitive thermogravimetric analysis coupled with gas chromatography and mass spectrometry (TGA-GC/MS) can prove the hexylation reaction. The efficiency of functionalization is comparable to reductive functionalization of pristine chemical vapor deposition (CVD)-graphene and bulk graphite.},
author = {Halbig, christina and Martin, Oliver and Hauke, Frank and Eigler, Siegfried and Hirsch, Andreas},
doi = {10.1002/chem.201802500},
faupublication = {yes},
journal = {Chemistry - A European Journal},
keywords = {graphene;oxo-functionalized graphene;reductive functionalization;statistical Raman spectroscopy;TGA-GC\MS},
pages = {13348-13354},
peerreviewed = {Yes},
title = {{Oxo}-{Functionalized} {Graphene}: {A} {Versatile} {Precursor} for {Alkylated} {Graphene} {Sheets} by {Reductive} {Functionalization}},
volume = {24},
year = {2018}
}
@article{faucris.120268984,
abstract = {The solubilization of single-walled carbon nanotubes (SWCNTs) by a novel tweezer-shaped molecule with perylene bisimide moieties that act as aromatic anchoring groups is presented. Encouraging results of the tweezer-dispersion concept is combined with the outstanding exfoliation and dispersion efficiencies of designed perylene bisimide derivatives, which have previously turned out as most-powerful SWCNT dispersants. Based on the preferred interaction between the nanotweezer and SWCNTs with diameters larger than 0.8 nm, the supernatant was depleted after mild centrifugation in SWCNT species of smaller diameters. Characterization was carried out by a combination of UV/Vis and nIR absorption spectroscopy as well as emission spectroscopy of the SWCNTs and perylene. This study presents the foundation for a further improvement of selective SWCNT dispersion and sorting by designed molecules. Tubethumping: Selective dispersion of single-walled carbon nanotubes (SWCNTs) in order to preferentially solubilize distinct diameters or even chiralities can be considered as the definitive sorting tool. The enrichment of SWCNTs with diameters larger than 0.8 nm by a novel tweezer-type dispersant with perylene bis(imide) moieties as SWCNT anchor groups is presented. Copyright © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.},
author = {Backes, Claudia and Schmidt, Cordula and Hauke, Frank and Hirsch, Andreas},
doi = {10.1002/asia.201000647},
faupublication = {yes},
journal = {Chemistry-An Asian Journal},
pages = {438-444},
peerreviewed = {Yes},
title = {{Perylene}-based nanotweezers: {Enrichment} of larger-diameter single-walled carbon nanotubes},
volume = {6},
year = {2011}
}
@article{faucris.106885724,
author = {Marcia, Mario and Hauke, Frank and Hirsch, Andreas},
doi = {10.1016/j.flatc.2017.01.001},
faupublication = {yes},
journal = {FlatChem},
keywords = {2D materials; Black phosphorus; Boron nitride; Graphene; Non-covalent functionalization; Perylene; Transition metal dichalcogenides},
pages = {89-103},
peerreviewed = {Yes},
title = {{Perylene}-based non-covalent functionalization of {2D} materials},
volume = {1},
year = {2017}
}
@article{faucris.113297624,
abstract = {Understanding the phenomenon of intense photoluminescence in carbon materials such as hydrogenated graphene, graphene nanoribbons, and so forth is at the forefront of investigations. In this study, six different types of hydrogenated graphene (phG) produced from different starting materials were fully characterized in terms of structure and optical spectroscopy. Comprehensive photoluminescence lifetime analyses of phGs were conducted by combining time-correlated single-photon counting with steady-state fluorescence spectroscopy and femtosecond transient absorption spectroscopy. The conclusion drawn from these assays is that graphene islands with diameters in the range from 1.1 to 1.75 nm reveal band gap photoluminescence between 450 and 800 nm. As a complement, phGs were implemented in hybrids with water-soluble electron accepting perylenediimides (PDIs). By virtue of mutual π-stacking and charge transfer interactions with graphene islands, PDIs assisted in stabilizing aqueous dispersion of phG. Implicit in these ground state interactions is the formation of 300 ps lived charge separated states once photoexcited.},
author = {Strauß, Volker and Schäfer, Ricarda and Hauke, Frank and Hirsch, Andreas and Guldi, Dirk Michael},
doi = {10.1021/jacs.5b07896},
faupublication = {yes},
journal = {Journal of the American Chemical Society},
pages = {13079-13086},
peerreviewed = {Yes},
title = {{Polyhydrogenated} {Graphene}: {Excited} {State} {Dynamics} in {Photo}- and {Electroactive} {Two}-{Dimensional} {Domains}},
volume = {137},
year = {2015}
}
@article{faucris.120032484,
author = {Hirsch, Andreas and Hauke, Frank},
doi = {10.1002/anie.201708211},
faupublication = {yes},
journal = {Angewandte Chemie International Edition},
keywords = {2D materials; Black phosphorus; Chemical functionalization; Graphene; Molybdenum disulfide},
pages = {4338-4354},
peerreviewed = {Yes},
title = {{Post}-{Graphene} {2D} {Chemistry}: {The} {Emerging} {Field} of {Molybdenum} {Disulfide} and {Black} {Phosphorus} {Functionalization}},
volume = {57},
year = {2018}
}
@article{faucris.106886384,
author = {Vecera, Philipp and Chacón-Torres, Julio C. and Pichler, Thomas and Reich, Stephanie and Soni, Himadriben and Görling, Andreas and Edelthalhammer, Konstantin and Peterlik, Herwig and Hauke, Frank and Hirsch, Andreas},
doi = {10.1038/ncomms15192},
faupublication = {yes},
journal = {Nature Communications},
peerreviewed = {Yes},
title = {{Precise} determination of graphene functionalization by in situ {Raman} spectroscopy},
volume = {8},
year = {2017}
}
@article{faucris.115048164,
abstract = {Covalent sidewall addition to single-walled nanotubes (SWNTs) of a series of organolithium and organomagnesium compounds (nBuLi, tBuLi, EtLi, nHexLi, nBuMgCl, tBuMgCl) followed by reoxidation is reported. The functionalized R-n-SWNTs were characterized by Raman and NIR emission spectroscopy. The reaction of SWNTs with organolithium and magnesium compounds exhibits pronounced selectivity: in general, metallic tubes are more reactive than semiconducting ones. The reactivity of SWNTs toward the addition of organometallic compounds is inversely proportional to the diameter of the tubes. This was determined simultaneously and independently for both metallic and semiconducting SWNTs. The reactivity also depends on the steric demands of the addend. Binding of the bulky t-butyl addend is less favorable than addition of primary alkyl groups. Significantly, although tBuLi is less reactive than, for example, nBuLi, it is less selective toward the preferred reaction with metallic tubes. This unexpected behavior is explained by fast electron transfer to the metallic SWNTs having low-lying electronic states close to the Fermi level, a competitive initial process. The NIR emission of weakly functionalized semiconducting SWNTs, also reported for the first time, implies interesting applications of functionalized tubes as novel fluorescent reporter molecules.},
author = {Wunderlich, David and Hauke, Frank and Hirsch, Andreas},
doi = {10.1002/chem.200701038},
faupublication = {yes},
journal = {Chemistry - A European Journal},
keywords = {carbon;electron transfer;nanotubes;nucleophilic addition;reactivity;selectivity},
month = {Jan},
pages = {1607-1614},
peerreviewed = {Yes},
title = {{Preferred} functionalization of metallic and small-diameter single-walled carbon nanotubes by nucleophilic addition of organolithium and -magnesium compounds followed by reoxidation},
volume = {14},
year = {2008}
}
@article{faucris.107640544,
abstract = {A selectivity investigation of the covalent sidewall functionalization of SWNTs by reductive alkylation (Billups reaction) is reported. The functionalized tubes R-SWNT were characterized by UV-vis-nIR absorption, nIR emission and Raman spectroscopy. The reduction of SWNTs with sodium and the subsequent alkylation of the reduced tubes SWNT with butyl iodide reveal a pronounced SWCNT diameter dependence, that is, SWNTs with smaller diameter are considerably more reactive than tubes with larger diameter. Moreover, this reaction sequence also favours the preferred functionalization of metallic over semiconducting tubes. Treatment of the reduced intermediates SWNT with protons, via the use of ethanol, instead of alkyl iodide leads to hydrogenated tubes. However, in this case the degree of functionalization is considerably lower than that observed for the corresponding alkylation. Also no pronounced preference of the reaction of metallic and small diameter tubes was observed during the hydrogenation process. © The Royal Society of Chemistry.},
author = {Wunderlich, David and Hauke, Frank and Hirsch, Andreas},
doi = {10.1039/b716732f},
faupublication = {yes},
journal = {Journal of Materials Chemistry},
pages = {1493-1497},
peerreviewed = {Yes},
title = {{Preferred} functionalization of metallic and small-diameter single walled carbon nanotubes via reductive alkylation},
volume = {18},
year = {2008}
}
@article{faucris.234245382,
abstract = {We present an overview of the main techniques for production and processing of graphene and related materials (GRMs), as well as the key characterization procedures. We adopt a 'hands-on' approach, providing practical details and procedures as derived from literature as well as from the authors' experience, in order to enable the reader to reproduce the results. Section I is devoted to 'bottom up' approaches, whereby individual constituents are pieced together into more complex structures. We consider graphene nanoribbons (GNRs) produced either by solution processing or by on-surface synthesis in ultra high vacuum (UHV), as well carbon nanomembranes (CNM). Production of a variety of GNRs with tailored band gaps and edge shapes is now possible. CNMs can be tuned in terms of porosity, crystallinity and electronic behaviour. Section II covers 'top down' techniques. These rely on breaking down of a layered precursor, in the graphene case usually natural crystals like graphite or artificially synthesized materials, such as highly oriented pyrolythic graphite, monolayers or few layers (FL) flakes. The main focus of this section is on various exfoliation techniques in a liquid media, either intercalation or liquid phase exfoliation (LPE). The choice of precursor, exfoliation method, medium as well as the control of parameters such as time or temperature are crucial. A definite choice of parameters and conditions yields a particular material with specific properties that makes it more suitable for a targeted application. We cover protocols for the graphitic precursors to graphene oxide (GO). This is an important material for a range of applications in biomedicine, energy storage, nanocomposites, etc. Hummers' and modified Hummers' methods are used to make GO that subsequently can be reduced to obtain reduced graphene oxide (RGO) with a variety of strategies. GO flakes are also employed to prepare three-dimensional (3d) low density structures, such as sponges, foams, hydro- or aerogels. The assembly of flakes into 3d structures can provide improved mechanical properties. Aerogels with a highly open structure, with interconnected hierarchical pores, can enhance the accessibility to the whole surface area, as relevant for a number of applications, such as energy storage. The main recipes to yield graphite intercalation compounds (GICs) are also discussed. GICs are suitable precursors for covalent functionalization of graphene, but can also be used for the synthesis of uncharged graphene in solution. Degradation of the molecules intercalated in GICs can be triggered by high temperature treatment or microwave irradiation, creating a gas pressure surge in graphite and exfoliation. Electrochemical exfoliation by applying a voltage in an electrolyte to a graphite electrode can be tuned by varying precursors, electrolytes and potential. Graphite electrodes can be either negatively or positively intercalated to obtain GICs that are subsequently exfoliated. We also discuss the materials that can be amenable to exfoliation, by employing a theoretical data-mining approach. The exfoliation of LMs usually results in a heterogeneous dispersion of flakes with different lateral size and thickness. This is a critical bottleneck for applications, and hinders the full exploitation of GRMs produced by solution processing. The establishment of procedures to control the morphological properties of exfoliated GRMs, which also need to be industrially scalable, is one of the key needs. Section III deals with the processing of flakes.},
author = {Backes, Claudia and Abdelkader, Amr M. and Alonso, Concepcion and Andrieux-Ledier, Amandine and Arenal, Raul and Azpeitia, Jon and Balakrishnan, Nilanthy and Banszerus, Luca and Barjon, Julien and Bartali, Ruben and Bellani, Sebastiano and Berger, Claire and Berger, Reinhard and Ortega, M. M. Bernal and Bernard, Carlo and Beton, Peter H. and Beyer, Andre and Bianco, Alberto and Boggild, Peter and Bonaccorso, Francesco and Barin, Gabriela Borin and Botas, Cristina and Bueno, Rebeca A. and Carriazo, Daniel and Castellanos-Gomez, Andres and Christian, Meganne and Ciesielski, Artur and Ciuk, Tymoteusz and Cole, Matthew T. and Coleman, Jonathan and Coletti, Camilla and Crema, Luigi and Cun, Huanyao and Dasler, Daniela and De Fazio, Domenico and Diez, Noel and Drieschner, Simon and Duesberg, Georg S. and Fasel, Roman and Feng, Xinliang and Fina, Alberto and Forti, Stiven and Galiotis, Costas and Garberoglio, Giovanni and Garcia, Jorge M. and Antonio Garrido, Jose and Gibertini, Marco and Goelzhaeuser, Armin and Gomez, Julio and Greber, Thomas and Hauke, Frank and Hemmi, Adrian and Hernandez-Rodriguez, Irene and Hirsch, Andreas and Hodge, Stephen A. and Huttel, Yves and Jepsen, Peter U. and Jimenez, Ignacio and Kaiser, Ute and Kaplas, Tommi and Kim, Hokwon and Kis, Andras and Papagelis, Konstantinos and Kostarelos, Kostas and Krajewska, Aleksandra and Lee, Kangho and Li, Changfeng and Lipsanen, Harri and Liscio, Andrea and Lohe, Martin R. and Loiseau, Annick and Lombardi, Lucia and Francisca Lopez, Maria and Martin, Oliver and Martin, Cristina and Martinez, Lidia and Angel Martin-Gago, Jose and Ignacio Martinez, Jose and Marzari, Nicola and Mayoral, Alvaro and Mcmanus, John and Melucci, Manuela and Mendez, Javier and Merino, Cesar and Merino, Pablo and Meyer, Andreas and Miniussi, Elisa and Miseikis, Vaidotas and Mishra, Neeraj and Morandi, Vittorio and Munuera, Carmen and Munoz, Roberto and Nolan, Hugo and Ortolani, Luca and Ott, Anna K. and Palacio, Irene and Palermo, Vincenzo and Parthenios, John and Pasternak, Iwona and Patane, Amalia and Prato, Maurizio and Prevost, Henri and Prudkovskiy, Vladimir and Pugno, Nicola and Rojo, Teofilo and Rossi, Antonio and Ruffieux, Pascal and Samori, Paolo and Schue, Leonard and Setijadi, Eki and Seyller, Thomas and Speranza, Giorgio and Stampfer, Christoph and Stenger, Ingrid and Strupinski, Wlodek and Svirko, Yuri and Taioli, Simone and Teo, Kenneth B. K. and Testi, Matteo and Tomarchio, Flavia and Tortello, Mauro and Treossi, Emanuele and Turchanin, Andrey and Vazquez, Ester and Villaro, Elvira and Whelan, Patrick R. and Xia, Zhenyuan and Yakimova, Rositza and Yang, Sheng and Reza Yazdi, G. and Yim, Chanyoung and Yoon, Duhee and Zhang, Xianghui and Zhuang, Xiaodong and Colombo, Luigi and Ferrari, Andrea C. and Garcia-Hernandez, Mar},
doi = {10.1088/2053-1583/ab1e0a},
faupublication = {yes},
journal = {2D Materials},
note = {CRIS-Team WoS Importer:2020-02-14},
peerreviewed = {Yes},
title = {{Production} and processing of graphene and related materials},
volume = {7},
year = {2020}
}
@article{faucris.242713670,
abstract = {A straightforward quantification method to consistently determine the overall functionalization degree of covalently modified two-dimensional (2D) black phosphorus (BP) by Raman spectroscopy has been carried out. Indeed, the successful reductive methylation of the BP lattice using sodium intercalation compounds and exhibiting different functionalization degrees has been demonstrated by P-31-magic angle spinning (MAS) NMR spectroscopy. Furthermore, the correlation of P-31-MAS NMR spectroscopy and statistical Raman spectroscopy (SRS) revealed the first method to determine the functionalization degree of BP solely by evaluating the intensities of distinct peaks in the Raman spectra of the covalently modified material, in a similar way to the widely employed I-D/I-G ratio of graphene research.},
author = {Wild, Stefan and Xuan Thong Dinh, and Maid, Harald and Hauke, Frank and Abellán, Gonzalo and Hirsch, Andreas},
doi = {10.1002/anie.202008646},
faupublication = {yes},
journal = {Angewandte Chemie International Edition},
note = {CRIS-Team WoS Importer:2020-09-18},
peerreviewed = {Yes},
title = {{Quantifying} the {Covalent} {Functionalization} of {Black} {Phosphorus}},
year = {2020}
}
@article{faucris.121270644,
abstract = {A novel series of fluorophore-heterofullerene conjugates 10-14 - the fluorophores range from benzene, naphthalene, phenanthrene, and fluorene to pyrene - was synthesized. NMR spectroscopy and quantum mechanical calculations demonstrate that the flexibility of the acetyl-group linker opens the way for conformations with π-π stacking interactions between the chromophores. This leads to favorable electronic communication between the two subsystems and is reflected in a series of ground- and excited-state assays ranging from fluorescence to fast transient absorption measure ments. It was found that a common deactivation process of the photoexcited fluorophores takes place, namely, a quantitative transduction of singlet excited state, yielding the heterofullerene singlet excited state. This reaction pathway leads to the long-lived and highly reactive fullerene triplet state, which forms, in a reaction with molecular oxygen, a cytotoxic oxygen species (i.e. singlet oxygen). © Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005.},
author = {Hauke, Frank and Hirsch, Andreas and Atalick, Stefan and Guldi, Dirk Michael and Hauke, Frank},
doi = {10.1002/ejoc.200400771},
faupublication = {yes},
journal = {European Journal of Organic Chemistry},
pages = {1741-1751},
peerreviewed = {Yes},
title = {{Quantitative} transduction of excited-state energy in fluorophore- heterofullerene conjugates},
year = {2005}
}
@article{faucris.107797184,
abstract = {We present the Raman bands of nano-graphene flakes (NG flakes) produced by oxidation of single-walled carbon nanotubes. These bands overlap with the defect-induced Raman modes of carbon nanotubes. This can lead to an overestimation of the defect density in the nanotubes. Here we analyze the line shape and the dispersion of this superimposing Raman band of NG flakes. Furthermore, we investigate the predicted Raman band of NG flakes next to the high-energy Raman modes (G- and G+) of the nanotubes. © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.},
author = {Laudenbach, Jan and Gebhardt, Benjamin and Syrgiannis, Zois and Hauke, Frank and Hirsch, Andreas and Maultzsch, Janina},
doi = {10.1002/pssb.201300224},
faupublication = {yes},
journal = {physica status solidi (b)},
pages = {2687-2691},
peerreviewed = {Yes},
title = {{Raman} bands of nano-graphene flakes on carbon nanotubes after oxidation},
volume = {250},
year = {2013}
}
@article{faucris.241507818,
abstract = {As an emerging field of research, graphene patterning has received considerable attention because of its ability to tailor the structure of graphene and the respective properties, aiming at practical applications such as electronic devices, catalysts, and sensors. Recent efforts in this field have led to the development of a variety of different approaches to pattern graphene sheets, providing a multitude of graphene patterns with different shapes and sizes. These established patterning techniques in combination with graphene chemistry have paved the road towards highly attractive chemical patterning approaches, establishing a very promising and vigorously developing research topic. In this review, an overview of commonly used strategies is presented that are categorized into top-down and bottom-up routes for graphene patterning, focusing mainly on new advances. Other than the introduction of basic concepts of each method, the advantages/disadvantages are compared as well. In addition, for the first time, an overview of chemical patterning techniques is outlined. At the end, the challenges and future perspectives in the field are envisioned.},
author = {Wei, Tao and Bao, Lipiao and Hauke, Frank and Hirsch, Andreas},
doi = {10.1002/cplu.202000419},
faupublication = {yes},
journal = {ChemPlusChem},
keywords = {covalent functionalization; graphene; lithography; nanostructures; patterning},
note = {CRIS-Team Scopus Importer:2020-08-14},
pages = {1655-1668},
peerreviewed = {Yes},
title = {{Recent} {Advances} in {Graphene} {Patterning}},
volume = {85},
year = {2020}
}
@article{faucris.114706284,
abstract = {The covalent functionalization of graphene represents a main topic in the growing field of nano materials. The reductive exfoliation of graphite with concomitant functionalization of the respective graphenide intermediates provides a promising approach towards functional graphene derivatives. In this article, we present new insights into the reductive arylation of graphene. Graphite intercalation compounds (GICs) with varying stoichiometries have been used as starting materials. Based on the spectroscopic data obtained by scanning Raman microscopy and thermogravimetric analysis coupled to mass spectrometry (TG/MS), a clear correlation between the amount of negative charges - present in the GIC - and the degree of functionalization in the final product could be found. Furthermore, the detailed analysis of the thermal defunctionalization process provided deeper insights into the covalent addend binding.},
author = {Vecera, Philipp and Edelthalhammer, Konstantin and Hauke, Frank and Hirsch, Andreas and Hauke, Frank},
doi = {10.1002/pssb.201451315},
faupublication = {yes},
journal = {physica status solidi (b)},
keywords = {Carbon allotropes; Functionalization; Graphene; Graphite intercalation compounds; Raman spectroscopy},
pages = {2536-2540},
peerreviewed = {Yes},
title = {{Reductive} arylation of graphene: {Insights} into a reversible carbon allotrope functionalization reaction},
volume = {251},
year = {2014}
}
@article{faucris.211517413,
abstract = {The reaction of neutral single-walled carbon nanotubes (SWCNTs) with diazonium salts proceeds with a high selectivity towards metallic carbon nanotube species; this reaction is well-understood and the mechanism has been elucidated. In the present joint theoretical and experimental study, we investigate the reaction of negatively charged SWCNTs -carbon nanotubides -with diazonium salts. Our density functional theory calculations predict a stronger binding of the aryl diazonium cations to charged metallic SWCNTs species and therefore lead to a preferential addend binding in the course of the reaction. The Raman resonance profile analysis on the reductive arylation of carbon nanotubides obtained by the solid state intercalation approach with potassium in varying concentrations confirms the predicted preferred functionalization of metallic carbon nanotubes. Furthermore, we were also able to show that the selectivity for metallic SWCNT species could be further increased when low potassium concentrations (K : C < 1 : 200) are used for an initial selective charging of the metallic species. Further insights into the nature of the bound addends were obtained by coupled thermogravimetric analysis of the functionalized samples.},
author = {Schirowski, Milan and Tyborski, Christoph and Maultzsch, Janina and Hauke, Frank and Hirsch, Andreas and Goclon, Jakub},
doi = {10.1039/c8sc03737j},
faupublication = {yes},
journal = {Chemical Science},
month = {Jan},
note = {CRIS-Team WoS Importer:2019-02-21},
pages = {706-717},
peerreviewed = {Yes},
title = {{Reductive} diazotation of carbon nanotubes: an experimental and theoretical selectivity study},
volume = {10},
year = {2019}
}
@article{faucris.106886604,
author = {Hou, Huilei and Dasler, Daniela and Hauke, Frank and Hirsch, Andreas},
doi = {10.1002/pssr.201700306},
faupublication = {yes},
journal = {Physica Status Solidi-Rapid Research Letters},
keywords = {diazonium; graphene; hybrid materials; porphyrine; radicals},
peerreviewed = {Yes},
title = {{Reductive} {Functionalization} of {Graphenides} {With} {Nickel}({II}) {Porphyrin} {Diazonium} {Compounds}},
volume = {11},
year = {2017}
}
@article{faucris.107628444,
abstract = {(Figure Presented) As if nothing had happened: A detailed mechanistic investigation of the nucleophilic addition of organolithium reagents onto single-walled carbon nanotubes (SWCNTs) revealed that the initial functionalization step is part of an equilibrium. Consequently, the functionalization of the sidewalls of SWCNTs is reversible, and the introduced substituents can be detached easily by reduction. © 2010 Wiley-VCH Verlag GmbH & Co. KGaA.},
author = {Syrgiannis, Zois and Gebhardt, Benjamin and Dotzer, Christoph and Hauke, Frank and Graupner, Ralf and Hirsch, Andreas and Hauke, Frank},
doi = {10.1002/anie.200906819},
faupublication = {yes},
journal = {Angewandte Chemie International Edition},
pages = {3322-3325},
peerreviewed = {Yes},
title = {{Reductive} retrofunctionalization of single-walled carbon nanotubes},
volume = {49},
year = {2010}
}
@article{faucris.120311884,
abstract = {Approaches for the selective self-assembly of functionalized carbon allotropes from solution are developed and validated for 0D-fullerenes, 1D-carbon nanotubes and 2D-graphene. By choosing the right molecular interaction of self-assembled monolayers (serving the surface) with the functionalization features of carbon materials, which provide the solubility but also serve the driving force for assembly, we demonstrate a region-selective and self-terminating assembly of the materials. Active layers of the carbon allotropes can be selectively deposited in the channel region of thin-film transistor (TFT) devices by this approach. As an example for a 0D system, molecules of C functionalized octadecylphosphonic acids are used to realize self-assembled monolayer field-effect transistors (SAMFETs) based on a selective molecular exchange reaction of stearic acid in the channel region. For noncovalently functionalized single-walled carbon nanotubes (SWCNTs) and graphene oxide (GO) flakes, the electrostatic Coulomb interactions between the functional groups of the carbon allotropes and the charged head groups of a SAM dielectric layer are utilized to implement the selective deposition. © 2013 American Chemical Societ},
author = {Wang, Zhenxing and Mohammadzadeh, Saeideh and Schmaltz, Thomas and Kirschner, Johannes and Khassanov, Artöm and Eigler, Siegfried and Mundloch, Udo and Backes, Claudia and Steinrück, Hans-Peter and Magerl, Andreas and Hauke, Frank and Hirsch, Andreas and Halik, Marcus and Hauke, Frank},
doi = {10.1021/nn405488n},
faupublication = {yes},
journal = {Acs Nano},
pages = {11427-11434},
peerreviewed = {Yes},
title = {{Region}-{Selective} {Self}-{Assembly} of {Functionalized} {Carbon} {Allotropes} from {Solution}},
url = {http://pubs.acs.org/doi/abs/10.1021/nn405488n},
volume = {7},
year = {2013}
}
@article{faucris.107713364,
abstract = {The treatment of monomeric azafullerene derivatives RCN with an excess of diethyl bromomalonate in the presence of DBU and dimethylanthracene leads to the regioselective formation of azafullerene pentamalonates with an octahedral C symmetrical addition pattern.},
author = {Hauke, Frank and Hirsch, Andreas and Hauke, Frank},
doi = {10.1039/b103169b},
faupublication = {yes},
journal = {Chemical Communications},
pages = {1316-1317},
peerreviewed = {Yes},
title = {{Regioselective} formation of highly functionalised heterofullerenes: {Pentamalonates} of {RC59N} involving an octahedral addition pattern},
year = {2001}
}
@article{faucris.120269204,
abstract = {We present resonant Raman measurements on single-walled carbon nanotubes covalently functionalized with lithium decyne. We study the influence of the functional moieties on the optical transitions of the nanotubes. From the extracted resonance profiles of the radial breathing modes the chiral indices of the corresponding tubes are assigned. Slight red shifts of the optical transitions are observed, which implies only a little charge transfer due to the chemical reaction. The reaction shows a pronounced diameter dependence as previously observed for comparable reactions with different addends.Carbon nanotubes covalently functionalized with decyne moieties. © 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.},
author = {Müller, Matthias and Meinke, Reinhard and Maultzsch, Janina and Gebhardt, Benjamin and Hauke, Frank and Hirsch, Andreas and Thomsen, Christian},
doi = {10.1002/pssb.201000349},
faupublication = {yes},
journal = {physica status solidi (b)},
pages = {2863-2866},
peerreviewed = {Yes},
title = {{Resonant} {Raman} scattering on carbon nanotubes covalently functionalized with lithium decyne},
volume = {247},
year = {2010}
}
@article{faucris.285401616,
author = {Vecera, Philipp and Chacón-Torres, Julio C. and Pichler, Thomas and Reich, Stephanie and Soni, Himadriben and Görling, Andreas and Edelthalhammer, Konstantin and Peterlik, Herwig and Hauke, Frank and Hirsch, Andreas},
doi = {10.1038/s41467-022-34281-x},
faupublication = {yes},
journal = {Nature Communications},
note = {CRIS-Team Scopus Importer:2022-11-18},
peerreviewed = {Yes},
title = {{Retraction} {Note}: {Precise} determination of graphene functionalization by in situ {Raman} spectroscopy},
volume = {13},
year = {2022}
}
@article{faucris.120269424,
abstract = {We report on the introduction of a systematic method for the quantitative and reliable characterization of covalently functionalized graphene based on Scanning-Raman-Microscopy (SRM). This allows for recording and analyzing several thousands of Raman spectra per sample and straightforward display of various Raman properties and their correlations with each other in histograms or coded 2D-plots. In this way, information about the functionalization efficiency of a given reaction, the reproducibility of the statistical analysis, and the sample homogeneity can be easily deduced. Based on geometric considerations, we were also able to provide, for the first time, a correlation between the mean defect distance of densely packed point defects and the Raman I/I ratio directly obtained from the statistical analysis. This proved to be the prerequisite for determining the degree of functionalization, termed θ. As model compounds, we have studied a series of arylated graphenes (GPh) for which we have developed new synthetic procedures. Both graphite and graphene grown by chemical vapor deposition (CVD) were used as starting materials. The best route toward GPh consisted of the initial reduction of graphite with a Na/K alloy in 1,2-dimethoxyethane (DME) as it yields the highest overall homogeneity of products reflected in the widths of the Raman I /I histograms. The Raman results correlate nicely with parallel thermogravimetric analysis (TGA) coupled with mass spectrometry (MS) studies. © 2013 American Chemical Society.},
author = {Englert, Jan and Vecera, Philipp and Knirsch, Kathrin and Schäfer, Ricarda and Hauke, Frank and Hirsch, Andreas and Hauke, Frank},
doi = {10.1021/nn401481h},
faupublication = {yes},
journal = {Acs Nano},
pages = {5472-5482},
peerreviewed = {Yes},
title = {{Scanning}-{Raman}-microscopy for the statistical analysis of covalently functionalized graphene},
volume = {7},
year = {2013}
}
@article{faucris.107629544,
abstract = {Reductive alkylation of three graphite starting materials G(flake), G(powder), and G(spherical) reveals pronounced differences in the obtained covalently functionalized graphene with respect to the degree of functionalization, exfoliation efficiency and product homogeneity, as demonstrated by statistical Raman microscopy (SRM), TGA/MS, IR-spectroscopy and solubility behavior.This journal is © The Royal Society of Chemistry 2013.},
author = {Knirsch, Kathrin and Englert, Jan and Dotzer, Christoph and Hauke, Frank and Hirsch, Andreas and Hauke, Frank},
doi = {10.1039/c3cc46621c},
faupublication = {yes},
journal = {Chemical Communications},
pages = {10811-10813},
peerreviewed = {Yes},
title = {{Screening} of the chemical reactivity of three different graphite sources using the formation of reductively alkylated graphene as a model reaction},
volume = {49},
year = {2013}
}
@article{faucris.120269644,
abstract = {The efficient and controllable synthesis, the detailed characterization, and the chemical postfunctionalization of polycarboxylated single-walled carbon nanotubes SWCNT(COOH) are reported. This innovative covalent sidewall functionalization method is characterized by (a) the preservation of the integrity of the entire σ-framework of SWCNTs; (b) the possibility of achieving very high degrees of addition; (c) control of the functionalization degrees by the variation of the reaction conditions (reaction time, ultrasonic treatment, pressure); (d) the identification of conditions for the selective functionalization of semiconducting carbon nanotubes, leaving unfunctionalized metallic tubes behind; (e) the proof that the introduced carboxylic acid functionalities can serve as versatile anchor points for the coupling to functional molecules; and (f) the application of a subsequent thermal degradation step of the functionalized semiconducting tubes leaving behind intact metallic SWCNTs. Functional derivatives have been characterized in detail by means of Raman, UV-vis/nIR, IR, and fluorescence spectroscopy as well as by thermogravimetric analysis combined with mass spectrometry, atomic force microscopy, and zeta-potential measurements. © 2011 American Chemical Society.},
author = {Gebhardt, Benjamin and Hof, Ferdinand and Backes, Claudia and Müller, Matthias and Plocke, Thomas and Maultzsch, Janina and Thomsen, Christian and Hauke, Frank and Hirsch, Andreas},
doi = {10.1021/ja206818n},
faupublication = {yes},
journal = {Journal of the American Chemical Society},
pages = {19459-19473},
peerreviewed = {Yes},
title = {{Selective} polycarboxylation of semiconducting single-walled carbon nanotubes by reductive sidewall functionalization},
volume = {133},
year = {2011}
}
@article{faucris.120032704,
author = {Gebhardt, Julian and Bosch, Sebastian and Hof, Ferdinand and Hauke, Frank and Hirsch, Andreas and Görling, Andreas},
doi = {10.1039/c5tc01407g},
faupublication = {yes},
journal = {Journal of Materials Chemistry C},
pages = {3937-3947},
peerreviewed = {Yes},
title = {{Selective} reduction of {SWCNTs}-concepts and insights},
volume = {5},
year = {2017}
}
@article{faucris.112965204,
abstract = {(Figure Presented) Single-layer graphene (SLG) is deposited onto Si/SiO substrates from aqueous dispersions using a scalable and quick detergent-based method (see figure). The deposits are analyzed using absorption and Raman spectroscopy and atomic force and optical microscopy. Evaluation of the two-phonon defect-induced Raman peak of individual particles on the substrate is used to confirm exfoliation into graphene monolayers. © 2009 Wiley-VCH Verlag GmbH & Co. KGaA.},
author = {Englert, Jan and Röhrl, Jonas and Schmidt, Cordula and Graupner, Ralf and Hundhausen, Martin and Hauke, Frank and Hirsch, Andreas},
doi = {10.1002/adma.200901578},
faupublication = {yes},
journal = {Advanced Materials},
pages = {4265-4269},
peerreviewed = {Yes},
title = {{Soluble} graphene: {Generation} of aqueous graphene solutions aided by a perylenebisimide-based bolaamphiphile},
volume = {21},
year = {2009}
}
@article{faucris.106738984,
abstract = {Herein, we report on a significant discovery, namely, the quantitative discharging of reduced graphite forms, such as graphite intercalation compounds, graphenide dispersions and graphenides deposited on surfaces with the simple solvent benzonitrile. Because of its comparatively low reduction potential, benzonitrile is reduced during this process to the radical anion, which exhibits a red colour and serves as a reporter molecule for the quantitative determination of negative charges on the carbon sheets. Moreover, this discovery reveals a very fundamental physical-chemical phenomenon, namely a quantitative solvent reduction induced and electrostatically driven mass transport of K + ions from the graphite intercalation compounds into the liquid. The simple treatment of dispersed graphenides suspended on silica substrates with benzonitrile leads to the clean conversion to graphene. This unprecedented procedure represents a rather mild, scalable and inexpensive method for graphene production surpassing previous wet-chemical approaches.},
author = {Vecera, Philipp and Holzwarth, Johannes and Mundloch, Udo and Edelthalhammer, Konstantin and Peterlik, Herwig and Hauke, Frank and Hirsch, Andreas},
doi = {10.1038/ncomms12411},
faupublication = {yes},
journal = {Nature Communications},
peerreviewed = {Yes},
title = {{Solvent}-driven electron trapping and mass transport in reduced graphites to access perfect graphene},
volume = {7},
year = {2016}
}
@article{faucris.274936273,
abstract = {We present an experimental study on the degree of covalent functionalization of graphene exfoliated on top of hBN stripes on Si/SiO2as well as on other two-dimensional (2D) materials. The underlying substrate has a strong effect on the degree of functionalization of graphene. Our results indicate that the functionalization of graphene is less effective on hBN than on SiO2, as shown by higher defect-induced modes in the graphene Raman spectra on SiO2. Other underlying 2D materials like MoS2, WS2, and MoO3show less contrast in functionalization density than hBN or lead to even higher degree of functionalization than the Si/SiO2substrate. Patterning the underlying material is therefore a versatile method for spatially defined functionalization of graphene because it preserves the intrinsic high-quality properties of graphene, a clear advantage over other patterning approaches based on masks or introduction of defects. Our work shows that the rich variety of 2D materials offers numerous possibilities to integrate graphene with different degrees of functionalization into van-der-Waals heterostructures and devices.},
author = {Dierke, Tobias and Dasler, Daniela and Nagel, Tamara and Hauke, Frank and Hirsch, Andreas and Maultzsch, Janina},
doi = {10.1021/acsanm.1c04559},
faupublication = {yes},
journal = {ACS Applied Nano Materials},
keywords = {2D materials; functionalization pattern; graphene; hBN; Raman spectroscopy; van-der-Waals heterostructures},
note = {CRIS-Team Scopus Importer:2022-05-13},
pages = {4966-4971},
peerreviewed = {Yes},
title = {{Spatial} {Control} of {Graphene} {Functionalization} by {Patterning} a {2D} {Substrate}: {Implications} for {Graphene} {Based} van-der-{Waals} {Heterostructures}},
volume = {5},
year = {2022}
}
@article{faucris.236673662,
abstract = {Patterned functionalization can, on the one hand, open the band gap of graphene and, on the other hand, program demanding designs on graphene. The functionalization technique is essential for graphene-based nanoarchitectures. A new and highly efficient method was applied to obtain patterned functionalization on graphene by mild fluorination with spatially arranged AgF arrays on the structured substrate. Scanning Raman spectroscopy (SRS) and scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy (SEM-EDS) were used to characterize the functionalized materials. For the first time, chemical patterning on the bottom side of graphene was realized. The chemical nature of the patterned functionalization was determined to be the ditopic scenario with fluorine atoms occupying the bottom side and moieties, such as oxygen-containing groups or hydrogen atoms, binding on the top side, which provides information about the mechanism of the fluorination process. Our strategy can be conceptually extended to pattern other functionalities by using other reactants. Bottom-side patterned functionalization enables utilization of the top side of a material, thereby opening up the possibilities for applications in graphene-based devices.},
author = {Bao, Lipiao and Zhao, Baolin and Lloret, Vicent and Halik, Marcus and Hauke, Frank and Hirsch, Andreas},
doi = {10.1002/anie.202002508},
faupublication = {yes},
journal = {Angewandte Chemie International Edition},
keywords = {ditopic functionalization; fluorination; graphene; substrate patterning},
note = {CRIS-Team Scopus Importer:2020-03-31},
peerreviewed = {Yes},
title = {{Spatially} {Resolved} {Bottom}-{Side} {Fluorination} of {Graphene} by {Two}-{Dimensional} {Substrate} {Patterning}},
year = {2020}
}
@article{faucris.284503392,
abstract = {Covalently patterned Janus-functionalized graphene featuring a spatially defined asymmetric bifacial addend binding motif remains a challenging synthetic target. Here, a facile and universal laser writing approach for a one-step covalent Janus patterning of graphene is reported, leading to the formation of up to now elusive graphene architectures, solely consisting of antaratopically functionalized superlattices. The structurally defined covalent functionalization procedure is based on laser-triggered concurrent photolysis of two different photosensitizers situated on both sides of the graphene plane, generating radicals and subsequent addend binding in the laser-irradiated areas only. Careful structure analysis was performed by Raman spectroscopy and Kelvin probe force microscopy. In terms of the advantages of our newly established concept, including a simple/easy-to-operate patterning procedure, arbitrary pattern availability, and a high degree of addend binding, an easy access to tailor-designed Janus-functionalized graphene devices with spatially resolved functional entities can be envisaged.},
author = {Al-Fogra, Sabrin and Yang, Bowen and Jurkiewicz, Lisa and Hauke, Frank and Hirsch, Andreas and Wei, Tao},
doi = {10.1021/jacs.2c07280},
faupublication = {yes},
journal = {Journal of the American Chemical Society},
note = {CRIS-Team Scopus Importer:2022-11-04},
peerreviewed = {Yes},
title = {{Spatially} {Resolved} {Janus} {Patterning} of {Graphene} by {Direct} {Laser} {Writing}},
year = {2022}
}
@article{faucris.107633284,
abstract = {Dedicated to Professor François Diederich on the occasion of his 60th birthday A powerful method based on statistical Raman analysis has been developed for the classification of the degree of functionalization, electronic selectivity, and sample homogeneity of functionalized carbon nanotubes (CNTs). The outcome of addition reactions to CNTs can easily be analyzed and quantitated by the determination of three characteristic Raman indices: the Raman defect (RDI), homogeneity (RHI), and selectivity index (RSI). Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.},
author = {Hof, Ferdinand and Bosch, Sebastian and Englert, Jan and Hirsch, Andreas and Hauke, Frank},
doi = {10.1002/anie.201204791},
faupublication = {yes},
journal = {Angewandte Chemie International Edition},
pages = {11727-11730},
peerreviewed = {Yes},
title = {{Statistical} raman spectroscopy: {An} method for the characterization of covalently functionalized single-walled carbon nanotubes},
volume = {51},
year = {2012}
}
@article{faucris.123842224,
abstract = {Covalently functionalizing mechanical exfoliated mono- and bilayer graphenides with λ-iodanes led to the discovery that the monolayers supported on a SiO2 substrate are considerably more reactive than bilayers as demonstrated by statistical Raman spectroscopy/microscopy. Supported by DFT calculations we show that ditopic addend binding leads to much more stable products than the corresponding monotopic reactions as a result of the much lower lattice strain of the reactions products. The chemical nature of the substrate (graphene versus SiO2) plays a crucial rol},
author = {Schäfer, Ricarda and Weber, Konstantin and Kolesnik-Gray, Maria and Hauke, Frank and Krstic, Vojislav and Meyer, Bernd and Hirsch, Andreas},
doi = {10.1002/anie.201607427},
faupublication = {yes},
journal = {Angewandte Chemie International Edition},
keywords = {functionalised grapnene; substrate interactions; chemical reactivity},
pages = {14858-14862},
peerreviewed = {Yes},
title = {{Substrate}-{Modulated} {Reductive} {Graphene} {Functionalization}},
volume = {55},
year = {2016}
}
@article{faucris.112568984,
abstract = {A novel supramolecular dyad (Zn-ttbpp-pyridine-CN) - with a quasi-linear geometry - involving a heterofullerene acceptor and a zinc tetrakis(p-tert-butylphenyl)porphyrin (Zn-ttbpp) donor was assembled via axial coordination. Depending on the solvent either photoinduced singlet-singlet energy transfer or electron transfer was observed. The latter process takes place in o-dichlorobenzene as solvent and leads to the corresponding charge-separated state, that is, the π-radical anion of CN and the π-radical cation of Zn-ttbpp.},
author = {Hauke, Frank and Swartz, Angela and Guldi, Dirk Michael and Hirsch, Andreas and Hauke, Frank},
doi = {10.1039/b202060b},
faupublication = {yes},
journal = {Journal of Materials Chemistry},
pages = {2088-2094},
peerreviewed = {Yes},
title = {{Supramolecular} assembly of a quasi-linear heterofullerene-porphyrin dyad},
volume = {12},
year = {2002}
}
@article{faucris.313208110,
abstract = {Three-dimensionally (3D) well-ordered and highly integrated graphene hybrid architectures are considered to be next-generation multifunctional graphene materials but still remain elusive. Here, we report the first realization of unprecedented 3D-patterned graphene nano-ensembles composed of a graphene monolayer, a tailor-made structured organophenyl layer, and three metal oxide films, providing the first example of such a hybrid nano-architecture. These spatially resolved and hierarchically structured quinary hybrids are generated via a two-dimensional (2D)-functionalization-mediated atomic layer deposition growth process, involving an initial lateral molecular programming of the graphene lattice via lithography-assisted 2D functionalization and a subsequent stepwise molecular assembly in these regions in the z-direction. Our breakthrough lays the foundation for the construction of emerging 3D-patterned graphene heterostructures.},
author = {Liu, Xin and Yang, Bowen and Zhou, Xin and Wu, Mingjian and Spiecker, Erdmann and Bachmann, Julien and Hauke, Frank and Hirsch, Andreas and Wei, Tao},
doi = {10.1002/anie.202314183},
faupublication = {yes},
journal = {Angewandte Chemie International Edition},
keywords = {3D Patterning; Atomic Layer Deposition; Graphene Chemistry; Heteroarchitectures; Molecular Assembly},
note = {CRIS-Team Scopus Importer:2023-10-27},
peerreviewed = {Yes},
title = {{Synergistic} {Combination} of {Reductive} {Covalent} {Functionalization} and {Atomic} {Layer} {Deposition}—{Towards} {Spatially} {Defined} {Graphene}-{Organic}-{Inorganic} {Heterostructures}},
year = {2023}
}
@article{faucris.120290764,
abstract = {A heterofullerene isoelectronic to C is reported. The azafullerenium cation CN can be isolated in good yield as a carborane salt via the two-electron oxidation of the C-C bond of (CN) dimer. [CN][Ag(CBHCl)] has been characterized by electronic, IR, Raman, and C NMR spectroscopies, MALDI spectrometry, DFT calculations, and X-ray crystallography. Copyright © 2003 American Chemical Society.},
author = {Kim, Kee-Chan and Hauke, Frank and Hirsch, Andreas and Boyd, Peter and Carter, Elizabeth and Armstrong, Robert and Lay, Peter and Reed, Christopher},
doi = {10.1021/ja034014r},
faupublication = {yes},
journal = {Journal of the American Chemical Society},
pages = {4024-4025},
peerreviewed = {Yes},
title = {{Synthesis} of the {C59N}+ carbocation. {A} monomeric azafullerene isoelectronic to {C60}},
volume = {125},
year = {2003}
}
@article{faucris.121273064,
abstract = {The highly regioselective attack of a C malonate containing a terminal acetyl function to the heterofullerene cage CN leads to the formation of the first fullerene-heterofullerene dyad, representing a new scaffold for directional energy transduction.},
author = {Hauke, Frank and Herranz, María Ángeles and Echegoyen, Luis and Guldi, Dirk Michael and Hirsch, Andreas and Atalick, Stefan and Hauke, Frank},
doi = {10.1039/B315006B},
faupublication = {yes},
journal = {Chemical Communications},
pages = {600-601},
peerreviewed = {Yes},
title = {{The} first fullerene-heterofullerene dyad},
volume = {10},
year = {2004}
}
@article{faucris.120272064,
abstract = {Carbon nanotubes and graphene are outstanding materials of the 21 century with a broad spectrum of applications. However, major challenges are faced such as the intrinsically low solubility of both sp carbon allotropes. To overcome this hurdle the potential of noncovalent functionalization is summarized with a special focus on the establishment of the perylene bisimide unit as aromatic anchor to the graphitic surface. Rational surfactant design is unmasked as the key to solubilization of the carbon allotropes, while at the same time tailoring their surface properties, or even electronic properties in a fully reversible fashion. Copyright © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.},
author = {Backes, Claudia and Hauke, Frank and Hirsch, Andreas},
doi = {10.1002/adma.201100300},
faupublication = {yes},
journal = {Advanced Materials},
pages = {2588-2601},
peerreviewed = {Yes},
title = {{The} potential of perylene bisimide derivatives for the solubilization of carbon nanotubes and graphene},
volume = {23},
year = {2011}
}
@article{faucris.106887484,
author = {Knirsch, Kathrin and Hof, Ferdinand and Lloret Segura, Vicente Josep and Mundloch, Udo and Hauke, Frank and Hirsch, Andreas},
doi = {10.1021/jacs.6b09487},
faupublication = {yes},
journal = {Journal of the American Chemical Society},
pages = {15642-15647},
peerreviewed = {Yes},
title = {{Topology}-{Driven} {Reductive} {Silylation} of {Synthetic} {Carbon} {Allotropes}},
volume = {138},
year = {2016}
}
@article{faucris.114578024,
abstract = {Abstractauthoren We study the vibrational, magnetic and transport properties of Few Layer Graphene (FLG) using Raman and electron spin resonance spectroscopy and microwave conductivity measurements. FLG samples were produced using wet chemical exfoliation with different post-processing, namely ultrasound treatment, shear mixing, and magnetic stirring. Raman spectroscopy shows a low intensity D mode which attests a high sample quality. The G mode is present at 1580 cm-1 as expected for graphene. The 2D mode consists of 2 components with varying intensities among the different samples. This is assigned to the presence of single and few layer graphene in the samples. Electron Spin Resonance (ESR) spectroscopy shows a main line in all types of materials with a width of about 1 mT and a g-factor in the range of 2.005-2.010. Paramagnetic defect centers with a uniaxial g-factor anisotropy are identified, which shows that these are related to the local sp2 bonds of the material. All kinds of investigated FLGs have a temperature dependent resistance which is compatible with a small gap semiconductor. The difference in resistance is related to the different grain size of the samples. © 2015 WILEY-VCH Verlag GmbH},
author = {Márkus, Bence G. and Simon, Ferenc and Chacón-Torres, Julio C. and Reich, Stephanie and Szirmai, Péter and Náfrádi, Bálint and Forró, László and Pichler, Thomas and Vecera, Philipp and Hauke, Frank and Hirsch, Andreas},
doi = {10.1002/pssb.201552296},
faupublication = {yes},
journal = {physica status solidi (b)},
keywords = {Chemical exfoliation; ESR; Graphene; Microwave conductivity; Raman},
pages = {2438-2443},
peerreviewed = {Yes},
title = {{Transport}, magnetic and vibrational properties of chemically exfoliated few-layer graphene},
volume = {252},
year = {2015}
}
@article{faucris.118784424,
abstract = {We have introduced an approach of mono- and hexakis-adducts of C-60 involving a T-h-symmetrical addition pattern, where up to 12 ferrocene or 10 ferrocene and one porphyrin units are linked flexibly to C-60 with the objective to systematically raise the energy of the radical ion pair state. A detailed electrochemical and photophysical investigation has shed light onto charge transfer events that depend largely on (i) the functionalization pattern of C-60, (ii) the donor strength of the donor, (iii) the excited-state energy of the predominant chromophore, and (iv) the solvent polarity. Considering (i)-(iv), the presence of the porphyrins is key to providing sufficient driving forces for affording spatially separated radical ion pair states. An ideal scenario, that is, testing ZnP-C-60-(Fc)(10) (19) in benzonitrile and DMF, allows storing nearly 1.7 eV in a nanosecond lived radical ion pair state. In this context, the flexible linkage, powering a through space charge transfer, prevents, however, stabilization of the radical ion pair state beyond nanoseconds.},
author = {Guldi, Dirk Michael and Ohkubo, Kei and Hauke, Frank and Hauke, Frank and Hirsch, Andreas and Spänig, Fabian and Fukuzumi, Shunichi and Kovács, Christian},
doi = {10.1021/ja900675t},
faupublication = {yes},
journal = {Journal of the American Chemical Society},
pages = {8180-8195},
peerreviewed = {Yes},
title = {{Tuning} {Charge} {Transfer} {Energetics} in {Reaction} {Center} {Mimics} via {Th}-{Functionalization} of {Fullerenes}},
volume = {131},
year = {2009}
}
@article{faucris.243613618,
abstract = {Chemical modification such as intercalation or doping of novel materials is of great importance for exploratory material science and applications in various fields of physics and chemistry. Herein, the systematic intercalation of chemically exfoliated few-layer graphene with potassium is reported while monitoring the sample resistance using microwave conductivity. It is found that the conductivity of the samples increases by about an order of magnitude upon potassium exposure. The increased number of charge carriers deduced from the electron spin resonance (ESR) intensity also reflects this increment. The doped phases exhibit two asymmetric Dysonian lines in ESR, a usual sign of the presence of mobile charge carriers. The width of the broader component increases with the doping steps; however, the narrow components seem to have a constant line width.},
author = {Márkus, Bence Gábor and Sági, Olivér and Kollarics, Sándor and Edelthalhammer, Konstantin and Hirsch, Andreas and Hauke, Frank and Szirmai, Péter and Náfrádi, Bálint and Forró, László and Simon, Ferenc},
doi = {10.1002/pssb.202000368},
faupublication = {yes},
journal = {physica status solidi (b)},
keywords = {charge transfer; doping; electron spin resonance; intercalation; spintronics},
note = {CRIS-Team Scopus Importer:2020-10-09},
peerreviewed = {Yes},
title = {{Tuning} {Conductivity} and {Spin} {Dynamics} in {Few}-{Layer} {Graphene} via {In} {Situ} {Potassium} {Exposure}},
year = {2020}
}
@article{faucris.119031044,
abstract = {Despite tremendous progress in dispersion and sorting of carbon nanotubes using surfactant systems in water, the effect of the surrounding aqueous medium is only poorly understood. Herein we present a study on the effect of pH and ionic strength on the adsorption behavior of surfactants on the SWCNT scaffold and the related differences in dispersion and individualization. We have turned to an anionic perylene bisimide dye as model surfactant, as the rich spectroscopy allows us to trace the interaction with and the packing densities on the SWCNTs. We show that higher ionic strength and high packing density is beneficial for the dispersion yield, while high net charge density on the surface is the crucial factor for exfoliation. The accessible tuning of the packing densities furthermore enabled the investigation of preferential interaction of the dye with certain nanotube species. Environmental effects: crucial factors for nanomaterial dispersion and exfoliation as demonstrated with the aid of a nanotube-perylene bisimide model system. © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.},
author = {Backes, Claudia and Hauke, Frank and Hirsch, Andreas and Hauke, Frank},
doi = {10.1002/pssb.201300109},
faupublication = {yes},
journal = {physica status solidi (b)},
pages = {2592-2598},
peerreviewed = {Yes},
title = {{Tuning} the adsorption of perylene-based surfactants on the surface of single-walled carbon nanotubes},
volume = {250},
year = {2013}
}
@article{faucris.240311134,
abstract = {Today's great challenges of energy and informational technologies are addressed with a singular compound, Li- and Na-doped few-layer graphene. All that is impossible for graphite (homogeneous and high-level Na doping) and unstable for single-layer graphene works very well for this structure. The transformation of the Raman G line to a Fano line shape and the emergence of strong, metallic-like electron spin resonance (ESR) modes attest the high level of graphene doping in liquid ammonia for both kinds of alkali atoms. The spin-relaxation time in our materials, deduced from the ESR line width, is 6-8 ns, which is comparable to the longest values found in spin-transport experiments on ultrahigh-mobility graphene flakes. This could qualify our material as a promising candidate in spintronics devices. On the other hand, the successful sodium doping, this being a highly abundant metal, could be an encouraging alternative to lithium batteries.},
author = {Márkus, B. G. and Szirmai, P. and Edelthalhammer, Konstantin and Eckerlein, P. and Hirsch, Andreas and Hauke, Frank and Nemes, N. M. and Chacón-Torres, Julio C. and Náfrádi, B. and Forró, L. and Pichler, T. and Simon, F.},
doi = {10.1021/acsnano.0c03191},
faupublication = {yes},
journal = {ACS nano},
keywords = {alkali atom doping; electron spin lifetime; electron spin resonance; few-layer graphene; Raman spectroscopy},
note = {CRIS-Team Scopus Importer:2020-07-10},
pages = {7492-7501},
peerreviewed = {Yes},
title = {{Ultralong} {Spin} {Lifetime} in {Light} {Alkali} {Atom} {Doped} {Graphene}},
volume = {14},
year = {2020}
}
@article{faucris.296094770,
abstract = {Multilayers of so-called 2D van der Waals materials have gained considerable attention as active components of next-generation electronic and optoelectronic technologies, with semiconducting black phosphorus (BP) regarded as one of the most promising systems. The applicability and performance limits of BP in both stand-alone and heterostructure-based multilayer devices are determined by individual flake charge transport properties, which synergistically depend on the number of layers and the strength of interlayer coupling between those. In this work, we study the DC electrical transport characteristics of high-quality BP field-effect devices within a wide range of flake thicknesses at room temperature. The experimental data show a non-trivial increase in conductivity and hole density with a reduced number of layers while maintaining constant field-effect mobility due to the prevalence of electron–phonon scattering. Based on the solution of the 1D Schrödinger–Poisson equation, we find that the observed phenomena are a direct consequence of non-negligible interlayer coupling, which in turn causes a local redistribution of free charge carriers towards the central layers. Our data show that due to the electrostatic conditions at the flake surfaces, a naturally protected 2D hole gas can be encapsulated in flakes as high as 10 nm, which preserves the bulk-like bandgap and effective carrier masses due to the electrostatic environment.},
author = {Kolesnik-Gray, Maria and Meingast, Laura and Siebert, Martin and Unbehaun, Tim and Huf, Tobias and Ellrott, Günter and Abellan Saez, Gonzalo and Wild, Stefan and Lloret Segura, Vicente Josep and Mundloch, Udo and Schwarz, Julian and Niebauer, Michael and Szabo, Maximilian and Rommel, Mathias and Hutzler, Andreas and Hauke, Frank and Hirsch, Andreas and Krstic, Vojislav},
doi = {10.1038/s41699-023-00384-2},
faupublication = {yes},
journal = {npj 2D Materials and Applications},
note = {CRIS-Team Scopus Importer:2023-04-14},
peerreviewed = {Yes},
title = {{Unconventional} conductivity increase in multilayer black phosphorus},
volume = {7},
year = {2023}
}
@article{faucris.234235533,
abstract = {Single-walled carbon nanotubes (SWCNTs) can be doped with potassium, similar to graphite, leading to intercalation compounds. These binary systems exhibit a clear metallic character. However, the entire picture of how electron doping (e-doping) modifies the SWCNTs' vibrational spectra as a function of their diameter, chirality, and metallicity is still elusive. Herein, we present a detailed study of the intercalation and solid state reduction of metallic and semiconducting enriched HiPco SWCNTs. We performed a combined experimental and theoretical study of the evolution of their Raman response with potassium exposure, focusing specifically on their radial breathing mode (RBM). We found the charge donated from the potassium atoms occupies antibonding π orbitals of the SWCNTs, weakening their C-C bonds, and reducing the RBM frequency. This RBM downshift with increasing doping level is quasi-linear with a steplike behavior when the Fermi level crosses a van Hove singularity for semiconducting species. Moreover, this weakening of the C-C bonds is greater with decreasing curvature, or increasing diameter. Overall, this suggests the RBM downshift with e-doping is proportional to both the SWCNT's integrated density of states (DOS) ϱ(ε) and diameter d. We have provided a precise and complete description of the complex electron doping mechanism in SWCNTs up to a charge density of -18 me/C, far beyond that achievable by standard gate voltage studies, not being the highest doping possible, but high enough to track the effects of doping in SWCNTs based on their excitation energy, diameter, band gap energy, chiral angle, and metallicity. This work is highly relevant to tuning the electronic properties of SWCNTs for applications in nanoelectronics, plasmonics, and thermoelectricity.},
author = {Kröckel, Claudia and Preciado-Rivas, María Rosa and Torres-Sánchez, Victor Alexander and Mowbray, Duncan J. and Reich, Stephanie and Hauke, Frank and Chacón-Torres, Julio C. and Hirsch, Andreas},
doi = {10.1021/jacs.9b11370},
faupublication = {yes},
journal = {Journal of the American Chemical Society},
note = {CRIS-Team Scopus Importer:2020-02-14},
pages = {2327-2337},
peerreviewed = {Yes},
title = {{Understanding} the {Electron}-{Doping} {Mechanism} in {Potassium}-{Intercalated} {Single}-{Walled} {Carbon} {Nanotubes}},
volume = {142},
year = {2020}
}
@article{faucris.106887704,
author = {Abellan Saez, Gonzalo and Schirowski, Milan and Edelthalhammer, Konstantin and Fickert, Michael and Werbach, Katharina and Peterlik, Herwig and Hauke, Frank and Hirsch, Andreas},
doi = {10.1021/jacs.7b00704},
faupublication = {yes},
journal = {Journal of the American Chemical Society},
pages = {5175-5182},
peerreviewed = {Yes},
title = {{Unifying} {Principles} of the {Reductive} {Covalent} {Graphene} {Functionalization}},
volume = {139},
year = {2017}
}
@article{faucris.107634824,
abstract = {The fullerenes, carbon nanotubes, and graphene have enriched the family of carbon allotropes over the last few decades. Synthetic carbon allotropes (SCAs) have attracted chemists, physicists, and materials scientists because of the sheer multitude of their aesthetically pleasing structures and, more so, because of their outstanding and often unprecedented properties. They consist of fully conjugated p-electron systems and are considered topologically confined objects in zero, one, or two dimensions.Among the SCAs, graphene shows the greatest potential for high-performance applications, in the field of nanoelectronics, for example. However, significant fundamental research is still required to develop graphene chemistry. Chemical functionalization of graphene will increase its dispersibility in solvents, improve its processing into new materials, and facilitate the combination of graphene's unprecedented properties with those of other compound classes.On the basis of our experience with fullerenes and carbon nanotubes, we have described a series of covalent and noncovalent approaches to generate graphene derivatives. Using water-soluble perylene surfactants, we could efficiently exfoliate graphite in water and prepare substantial amounts of single-layer-graphene (SLG) and few-layer-graphene (FLG). At the same time, this approach leads to noncovalent graphene derivatives because it establishes efficient π-π-stacking interactions between graphene and the aromatic perylene chromophors supported by hydrophobic interactions.To gain efficient access to covalently functionalized graphene we employed graphite intercalation compounds (GICs), where positively charged metal cations are located between the negatively charged graphene sheets. The balanced combination of intercalation combined with repulsion driven by Coulombic interactions facilitated efficient exfoliation and wet chemical functionalization of the electronically activated graphene sheets via trapping with reactive electrophilic addends. For example, the treatment of reduced graphite with aryl diazonium salts with the elimination of N led to the formation of arylated graphene. We obtained alkylated graphene via related trapping reactions with alkyl iodides.These new developments have opened the door for combining the unprecedented properties of graphene with those of other compound classes. We expect that further studies of the principles of graphene reactivity, improved characterization methods, and better synthetic control over graphene derivatives will lead to a whole series of new materials with highly specific functionalities and enormous potential for attractive applications. © 2012 American Chemical Society.},
author = {Hirsch, Andreas and Englert, Jan and Hauke, Frank},
doi = {10.1021/ar300116q},
faupublication = {yes},
journal = {Accounts of Chemical Research},
pages = {87-96},
peerreviewed = {Yes},
title = {{Wet} chemical functionalization of graphene},
volume = {46},
year = {2013}
}